[PATCH] doc: Fix rendering of dumpdef examples

[Eric Blake]

doc/m4.texi (tabchar): Fix macro so that @c does not eat rest of line.
Fix suggested by Patrice Dumas <pertusus@free.fr>
Reported-by: 4dr14n31t0r Th3 G4m3r <4dr14n31t0r@gmail.com>
https://lists.gnu.org/archive/html/bug-m4/2021-10/msg00000.html
Fixes: 81795b2967716
---
 doc/m4.texi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/doc/m4.texi b/doc/m4.texi
index 3b833b2a..5591493c 100644
--- a/doc/m4.texi
+++ b/doc/m4.texi
@@ -16,6 +16,7 @@
 @c literal tabs in texinfo lead to formatting issues.
 @macro tabchar
 @      @c
+
 @end macro

 @c @ovar{ARG}
-- 
2.31.1