[gdb/doc] Fix "Standard Replies" xref

When building gdb with an older makeinfo (4.13), I run into:
...
gdb/doc/gdb.texinfo:42613: warning: `.' or `,' must follow @xref, not `f'.
...

This is related to this line:
...
@xref{Standard Replies} for standard error responses, and how to
respond indicating a command is not supported.
...

Fix this by adding a comma.

Tested by rebuilding the docs.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Co-Authored-By: Eli Zaretskii <eliz@gnu.org>

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 980ccdb5f4049a4ac44c2cd2fb97a25a9963769b..2909fc71510c4f7ae9a61d117c8702e5f10b7444 100644 (file)
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -42817,7 +42817,7 @@ seven repeats (@samp{$}) can be expanded using a repeat count of only
 five (@samp{"}).  For example, @samp{00000000} can be encoded as
 @samp{0*"00}.
 
-@xref{Standard Replies} for standard error responses, and how to
+@xref{Standard Replies}, for standard error responses, and how to
 respond indicating a command is not supported.
 
 In describing packets (commands and responses), each description has a