Fix italic font issue by applying C-style code block formatting.

Author: OreoYang

CN/modules/ROOT/pages/master/6.3.5.adoc

@@ -27,7 +27,7 @@ IvorySQL提供了兼容Oracle的NLS参数功能，包含如下参数。
 IvorySQL中的数据类型存在一个属性修饰符 `typmod` ，是对类型的补充说明，比如在 `VARCHAR(n)` 类型中，`n` 就是类型修饰符。
 
 在创建或修改表的列时可以指定长度类型，例如:
-```
+```c
 	ivorysql=# create table t1(name varchar2(2 byte));
 ```
 
@@ -37,7 +37,7 @@ IvorySQL中的数据类型存在一个属性修饰符 `typmod` ，是对类型
 
 在语法解析文件 ora_gram.y中，存在如下代码来根据 `nls_length_semantics` 把原本的 `char/varchar/varchar2` 类型改成 `oracharchar` 或者 `oracharbyte` ：
 
-```
+```c
 CharacterWithLength:  character '(' Iconst ')'
 				{
 					if (ORA_PARSER == compatible_db)
@@ -71,7 +71,7 @@ CharacterWithLength:  character '(' Iconst ')'
 ```
 
 IvorySQL 中数据类型 `oracharchar` 和 `oracharbyte` 的修饰符输入输出函数包括：
-```
+```c
 oravarcharchartypmodout() 
 oravarcharbytetypmodout() 
 oracharbytetypmodout()
@@ -83,7 +83,7 @@ oracharchartypmodout()
 `nls_length_semantics` 另一个作用是限制表中的列长度：
 根据上述代码在语法解析文件 ora_gram.y中，如果原本的 `varchar` 类型被转换成了 `oracharchar` 类型，则函数 `oravarcharchar()` 会被调用，而 `pg_mbcharcliplen()` 函数计算字符长度，而不是字节长度。
 
-```
+```c
 Datum
 oravarcharchar(PG_FUNCTION_ARGS)
 {
@@ -112,15 +112,15 @@ oravarcharchar(PG_FUNCTION_ARGS)
 === GUC参数 `datetime_ignore_nls_mask`
 
 这个参数被定义为一个int值，低四位分别表示是否在相应的日期时间格式上忽略NLS参数的影响，掩码定义如下：
-```
+```c
 #define ORADATE_MASK			0x01
 #define ORATIMESTAMP_MASK		0x02
 #define ORATIMESTAMPTZ_MASK		0x04
 #define ORATIMESTAMPLTZ_MASK	0x08
 ```
 
 在源代码中，这个GUC参数被用于下面这些函数：
-```
+```c
 oradate_in()
 oratimestamp_in()
 oratimestampltz_in()
@@ -134,7 +134,7 @@ oratimestamptz_in()
 这三个GUC参数，在函数 `ora_do_to_timestamp()` 中做为格式字符串，对输入的字符串进行格式检查与模式识别。
 
 下面是其默认值，可以通过设置其值为"pg"使其失效。"pg"表示禁用NLS特定行为，恢复为PostgreSQL的默认行为。
-```
+```c
 char	   *nls_date_format = "YYYY-MM-DD";
 char	   *nls_timestamp_format = "YYYY-MM-DD HH24:MI:SS.FF6";
 char	   *nls_timestamp_tz_format = "YYYY-MM-DD HH24:MI:SS.FF6 TZH:TZM";
@@ -146,7 +146,7 @@ char	   *nls_timestamp_tz_format = "YYYY-MM-DD HH24:MI:SS.FF6 TZH:TZM";
 
 默认值如下:
 
-```
+```c
 char	   *nls_territory = "AMERICA";
 char	   *nls_currency = "$";
 char	   *nls_iso_currency = "AMERICA";

CN/modules/ROOT/pages/master/7.17.adoc

@@ -30,7 +30,7 @@ IvorySQL提供兼容Oracle的NLS参数功能。
 
 === NLS 日期掩码设置
 示例：
-```
+```c
 ivorysql=# set ivorysql.datetime_ignore_nls_mask = 0;
 SET
 ivorysql=# select '2025-10-15 11:00:00.102030 CST'::oratimestamp ;
@@ -48,7 +48,7 @@ ivorysql=# select '2025-10-15 11:00:00.102030 CST'::oratimestamp ;
 
 === 禁用NLS日期/时间戳参数
 示例：
-```
+```c
 ivorysql=# select '2025-10-15 11:00:00.102030 '::oratimestamp ;
         oratimestamp
 ----------------------------
@@ -65,7 +65,7 @@ LINE 1: select '2025-10-15 11:00:00.102030 '::oratimestamp ;
 === 设置nls_length_semantics
 IvorySQL使用nls_length_semantics参数的值来决定长度类型，有byte和char两种值，默认为byte。
 示例：
-```
+```c
 vorysql=# alter session set nls_length_semantics = char;
 SET
 ivorysql=# create table character_tb(char_c char(6), char_b varchar2(6 byte), char_v varchar(6));
@@ -87,7 +87,7 @@ ivorysql=# select length(char_b), length(char_c), length(char_v) from character_
 ```
 === 设置NLS货币符号
 示例：
-```
+```c
 ivorysql=# show ivorysql.identifier_case_switch;
  ivorysql.identifier_case_switch
 ---------------------------------

EN/modules/ROOT/pages/master/6.3.5.adoc

@@ -24,7 +24,7 @@ IvorySQL provides Oracle-compatible NLS (National Language Support) parameter fu
 === Parameter `nls_length_semantics`
 
 In IvorySQL, data types have an attribute modifier called typmod, which provides additional information about the type. For example, in `VARCHAR(n)`, n is the type modifier. When creating or modifying table columns, you can specify the length type, such as:
-```
+```c
 	ivorysql=# create table t1(name varchar2(2 byte));
 ```
 
@@ -33,7 +33,7 @@ For columns of type `CHAR`, `VARCHAR`, or `VARCHAR2`, if the length type is not
 Note that the `nls_length_semantics` parameter only affects newly created columns and has no impact on existing columns.
 
 In the syntax parsing file ora_gram.y, the following code converts the original `CHAR`, `VARCHAR`, or `VARCHAR2` types to oracharchar or oracharbyte based on `nls_length_semantics`.
-```
+```c
 CharacterWithLength:  character '(' Iconst ')'
 				{
 					if (ORA_PARSER == compatible_db)
@@ -67,7 +67,7 @@ CharacterWithLength:  character '(' Iconst ')'
 ```
 
 The input/output functions for the oracharchar and oracharbyte data types in IvorySQL include:
-```
+```c
 oravarcharchartypmodout() 
 oravarcharbytetypmodout() 
 oracharbytetypmodout() 
@@ -77,7 +77,7 @@ oracharchartypmodout()
 These functions call the C-language function `anychar_typmodout()`, which adjusts the output to include `BYTE` or `CHAR` based on the value of `nls_length_semantics`.
 
 Another role of `nls_length_semantics` is to limit column lengths in tables. If the original `VARCHAR` type is converted to `oracharchar`, the function `oravarcharchar()` is called, and `pg_mbcharcliplen()` calculates the character length instead of the byte length.
-```
+```c
 Datum
 oravarcharchar(PG_FUNCTION_ARGS)
 {
@@ -106,7 +106,7 @@ oravarcharchar(PG_FUNCTION_ARGS)
 === GUC Parameter `datetime_ignore_nls_mask`
 
 This parameter is defined as an int value, where the lower four bits indicate whether to ignore NLS parameter influence on the corresponding date-time formats. The mask definitions are:
-```
+```c
 #define ORADATE_MASK			0x01
 #define ORATIMESTAMP_MASK		0x02
 #define ORATIMESTAMPTZ_MASK		0x04
@@ -115,7 +115,7 @@ This parameter is defined as an int value, where the lower four bits indicate wh
 
 In the source code, this GUC parameter is used in the following functions:
 
-```
+```c
 oradate_in()
 oratimestamp_in()
 oratimestampltz_in()
@@ -127,7 +127,7 @@ If the corresponding mask is set, the native PostgreSQL processing function is c
 === GUC Parameters `nls_date_format` `nls_timestamp_format` `nls_timestamp_tz_format` 
 
 These three GUC parameters serve as format strings in the function `ora_do_to_timestamp()` for checking and parsing input strings. Their default values are:
-```
+```c
 char	   *nls_date_format = "YYYY-MM-DD";
 char	   *nls_timestamp_format = "YYYY-MM-DD HH24:MI:SS.FF6";
 char	   *nls_timestamp_tz_format = "YYYY-MM-DD HH24:MI:SS.FF6 TZH:TZM";
@@ -139,7 +139,7 @@ Setting these values to "pg" disables NLS-specific behavior, reverting to Postgr
 Currently, `nls_territory` and `nls_iso_currency` support the values CHINA and AMERICA.
 
 The default values are:
-```
+```c
 char	   *nls_territory = "AMERICA";
 char	   *nls_currency = "$";
 char	   *nls_iso_currency = "AMERICA";

EN/modules/ROOT/pages/master/7.17.adoc

@@ -30,7 +30,7 @@ The following parameters are included:
 === NLS Date Mask Settings
 
 Example:
-```
+```c
 ivorysql=# set ivorysql.datetime_ignore_nls_mask = 0;
 SET
 ivorysql=# select '2025-10-15 11:00:00.102030 CST'::oratimestamp ;
@@ -49,7 +49,7 @@ ivorysql=# select '2025-10-15 11:00:00.102030 CST'::oratimestamp ;
 === Disabling NLS Date or Timestamp Format
 
 Example:
-```
+```c
 ivorysql=# select '2025-10-15 11:00:00.102030 '::oratimestamp ;
         oratimestamp
 ----------------------------
@@ -68,7 +68,7 @@ LINE 1: select '2025-10-15 11:00:00.102030 '::oratimestamp ;
 IvorySQL uses the value of the `nls_length_semantics` parameter to determine the length type, which can be either BYTE or CHAR (default is BYTE )。
 
 Example:
-```
+```c
 ivorysql=# alter session set nls_length_semantics = char;
 SET
 ivorysql=# create table character_tb(char_c char(6), char_b varchar2(6 byte), char_v varchar(6));
@@ -92,7 +92,7 @@ ivorysql=# select length(char_b), length(char_c), length(char_v) from character_
 === NLS Currency Symbols Settings
 
 Example:
-```
+```c
 ivorysql=# show ivorysql.identifier_case_switch;
  ivorysql.identifier_case_switch
 ---------------------------------