[PATCH] doc: use @xref correctly

[Eric Blake]

Silences this warning from new-enough texinfo:
./doc/autoconf.texi:14236: warning: @xref node name should not contain `.'

* doc/autoconf.texi (Macro Definitions): No need for .info.

Signed-off-by: Eric Blake <address@hidden>
---

Pushing this obvious fix.

 doc/autoconf.texi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 1838d6b..029ddd6 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -14212,7 +14212,7 @@ Macro Definitions
 @end example

 You can refer to any arguments passed to the macro as @samp{$1},
address@hidden, etc.  @xref{Definitions, , How to define new macros, m4.info,
address@hidden, etc.  @xref{Definitions, , How to define new macros, m4,
 GNU M4}, for more complete information on writing M4 macros.

 Most macros fall in one of two general categories.  The first category
-- 
2.7.4