Fix markup in dired-x.texi

* doc/misc/dired-x.texi (Omitting Variables)
(Local Variables, Shell Command Guessing)
(Advanced Cleaning Variables, Special Marking Function): Fix
markup and indexing.  (Bug#14212)
1 job for emacs-26 in 25 minutes and 29 seconds (queued for 3 seconds)
Status Job ID Name Coverage
failed #3003


Name Stage Failure
test Test
make[2]: *** [check-doit] Error 1
Makefile:285: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:255: recipe for target 'check' failed
make[1]: *** [check] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:951: recipe for target 'check' failed
make: *** [check] Error 2
ERROR: Job failed: exit code 1