[cli] help misses --suppress-xml description (#2436)

Author: FrancescElies

cli/cmdlineparser.cpp

@@ -1141,6 +1141,10 @@ void CmdLineParser::printHelp()
               "    --suppressions-list=<file>\n"
               "                         Suppress warnings listed in the file. Each suppression\n"
               "                         is in the same format as <spec> above.\n"
+              "    --suppress-xml=<file>\n"
+              "                         Suppress warnings listed in a xml file. XML file should\n"
+              "                         follow the manual.pdf format specified in section.\n"
+              "                         `6.4 XML suppressions` .\n"
               "    --template='<text>'  Format the error messages. Available fields:\n"
               "                           {file}              file name\n"
               "                           {line}              line number\n"