Shell: Fix badly worded help string for '--format'

Author: https://github.com/alimpfard
Commit: 2c3842bfe6
Pull-request: https://github.com/SerenityOS/serenity/pull/3664
Reviewed-by: https://github.com/awesomekling

Shell/main.cpp

@@ -111,7 +111,7 @@ int main(int argc, char** argv)
     Core::ArgsParser parser;
     parser.add_option(command_to_run, "String to read commands from", "command-string", 'c', "command-string");
     parser.add_option(skip_rc_files, "Skip running shellrc files", "skip-shellrc", 0);
-    parser.add_option(format, "File to format", "format", 0, "file");
+    parser.add_option(format, "Format the given file into stdout and exit", "format", 0, "file");
     parser.add_option(should_format_live, "Enable live formatting", "live-formatting", 'f');
     parser.add_positional_argument(file_to_read_from, "File to read commands from", "file", Core::ArgsParser::Required::No);
     parser.add_positional_argument(script_args, "Extra argumets to pass to the script (via $* and co)", "argument", Core::ArgsParser::Required::No);