added/adjusted --xml-version documentation (#4032)

Author: firewave

cli/cmdlineparser.cpp

@@ -1253,6 +1253,9 @@ void CmdLineParser::printHelp()
     "    -v, --verbose        Output more detailed error information.\n"
     "    --version            Print out version number.\n"
     "    --xml                Write results in xml format to error stream (stderr).\n"
+    "    --xml-version=<version>\n"
+    "                         Select the XML file version. Also implies --xml.\n"
+    "                         Currently only version 2 is available. The default version is 2.\n"
     "\n"
     "Example usage:\n"
     "  # Recursively check the current folder. Print the progress on the screen and\n"

man/cppcheck.1.xml

@@ -610,7 +610,7 @@ There are false positives with this option. Each result must be carefully invest
           <option>--xml-version=&lt;version&gt;</option>
         </term>
         <listitem>
-          <para>Select the XML file version. Currently versions 1 and 2 are available. The default version is 1.</para>
+          <para>Select the XML file version. Also implies --xml. Currently only version 2 is available. The default version is 2.</para>
         </listitem>
       </varlistentry>
     </variablelist>