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

Author: OreoYang

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
+```sql
 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
+```sql
 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
+```sql
 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
+```sql
 ivorysql=# show ivorysql.identifier_case_switch;
  ivorysql.identifier_case_switch
 ---------------------------------

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

@@ -30,7 +30,7 @@ The following parameters are included:
 === NLS Date Mask Settings
 
 Example:
-```c
+```sql
 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
+```sql
 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
+```sql
 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
+```sql
 ivorysql=# show ivorysql.identifier_case_switch;
  ivorysql.identifier_case_switch
 ---------------------------------