[gcc r12-5516] docs: Add missing @option keyword.

[Martin Liska <marxin@gcc.gnu.org>]

https://gcc.gnu.org/g:1167d4890f7aba2bc173a4f4abb10d86e306864c

commit r12-5516-g1167d4890f7aba2bc173a4f4abb10d86e306864c
Author: Martin Liska <mliska@suse.cz>
Date:   Thu Nov 25 12:13:59 2021 +0100

    docs: Add missing @option keyword.
    
    gcc/ChangeLog:
    
            * doc/invoke.texi: Use @option for -Wuninitialized.

Diff:
---
 gcc/doc/invoke.texi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index d0ac59768b9..3bddfbaae6a 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -12117,8 +12117,8 @@ Initialize automatic variables with either a pattern or with zeroes to increase
 the security and predictability of a program by preventing uninitialized memory
 disclosure and use.
 GCC still considers an automatic variable that doesn't have an explicit
-initializer as uninitialized, -Wuninitialized will still report warning messages
-on such automatic variables.
+initializer as uninitialized, @option{-Wuninitialized} will still report
+warning messages on such automatic variables.
 With this option, GCC will also initialize any padding of automatic variables
 that have structure or union types to zeroes.