[gcc r12-1333] Fix doc/typo

[Jeff Law]

https://gcc.gnu.org/g:5d8321127704ed0cca6d6008eafce2e9b8adf96c

commit r12-1333-g5d8321127704ed0cca6d6008eafce2e9b8adf96c
Author: imba-tjd <109224573@qq.com>
Date:   Wed Jun 9 11:28:42 2021 -0400

    Fix doc/typo
    
    gcc/
    
            * doc/invoke.texi: Fix typo.

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 24dc0491901..443252a83f1 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -31850,8 +31850,8 @@ startup object and entry point.
 This option is available for Cygwin and MinGW targets.  It
 specifies that the @code{dllimport} attribute should be ignored.
 
-@item -mthread
-@opindex mthread
+@item -mthreads
+@opindex mthreads
 This option is available for MinGW targets. It specifies
 that MinGW-specific thread support is to be used.