[patch] Add -q in help info and doc

[Mingjie Xing]

Hello,

I notice that "-q" and "--silent" options are not mentioned in gdb's
help information. This patch just adds them and updates the document.

Besides, most options in gdb document are using "-" prefix instead of "--".

ChangeLog

        * gdb.texinfo (Invoking GDB): Add -q and --quiet.
        * main.c (print_gdb_help): Add -q and --silent.

Is it OK?

Best regards,
Mingjie
-------------- next part --------------
A non-text attachment was scrubbed...
Name: gdb-help-info.patch
Type: text/x-patch
Size: 1154 bytes
Desc: not available
URL: <http://sourceware.org/pipermail/gdb-patches/attachments/20140606/31ceb1dc/attachment.bin>