Add another link of a GUC variable to where it is explained.
treec3be4e1b910d4fd3776c442b466800ac308a583c
-rw-r--r-- 1192 COPYRIGHT
-rw-r--r-- 4269 GNUmakefile.in
-rw-r--r-- 1423 Makefile
-rw-r--r-- 1287 README
-rw-r--r-- 767 README.CVS
-rw-r--r-- 387 aclocal.m4
drwxr-xr-x - config
-rwxr-xr-x 802000 configure
-rw-r--r-- 61056 configure.in
drwxr-xr-x - contrib
drwxr-xr-x - doc
drwxr-xr-x - src