[PATCH] doc: fix dejagnu variable references

While there is a RUNTESTDEFAULTFLAGS, there is no AM_ variant.  The
docs probably meant RUNTESTFLAGS which has the variants and is meant
to be overridden by people, so swap the name in the docs.

* doc/automake.texi (Other Variables): Change RUNTESTDEFAULTFLAGS to
RUNTESTFLAGS.
---
 doc/automake.texi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/automake.texi b/doc/automake.texi
index c8501aaaf1e3..5f70e370c158 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -12578,8 +12578,8 @@ Automake to think that this is actually a per-target variable (like
 There are other variables in Automake that follow similar principles
 to allow user options.  For instance, Texinfo rules (@pxref{Texinfo})
 use @code{MAKEINFOFLAGS} and @code{AM_MAKEINFOFLAGS}.  Similarly,
-DejaGnu tests (@pxref{DejaGnu Tests}) use @code{RUNTESTDEFAULTFLAGS} and
-@code{AM_RUNTESTDEFAULTFLAGS}.  The tags and ctags rules
+DejaGnu tests (@pxref{DejaGnu Tests}) use @code{RUNTESTFLAGS} and
+@code{AM_RUNTESTFLAGS}.  The tags and ctags rules
 (@pxref{Tags}) use @code{ETAGSFLAGS}, @code{AM_ETAGSFLAGS},
 @code{CTAGSFLAGS}, and @code{AM_CTAGSFLAGS}.  Java rules
 (@pxref{Java}) use @code{JAVACFLAGS} and @code{AM_JAVACFLAGS}.  None
-- 
2.30.0