Updated comments in code

src/cppcheck.h

@@ -88,8 +88,9 @@ public:
      * @param argc argc from main()
      * @param argv argv from main()
      * @return Empty string if parameters were accepted, or
-     * string containing "help" text if no files were found to be
-     * checked.
+     * string containing "help" text if no parameters were given or
+     * -h or --help parameters was given. Or error message if no
+     * files were found or if invalid parameter was given.
      */
     std::string parseFromArgs(int argc, const char* const argv[]);