Clarify `debug' doc string

* lisp/emacs-lisp/debug.el (debug): Mention that inhibit-redisplay
will inhibit the function.
1 job for master in 53 minutes and 27 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #3424
test-all

00:53:27

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:319: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:294: recipe for target 'check-expensive' failed
make[1]: Leaving directory '/builds/emacs/emacs/test'
make[1]: *** [check-expensive] Error 2
make: *** [check-expensive] Error 2
Makefile:959: recipe for target 'check-expensive' failed
ERROR: Job failed: exit code 1