Merge branch 'sc/help-autocorrect-one'

"[help] autocorrect = 1" used to be a way to say "please wait for
0.1 second after suggesting a typofix of the command name before
running that command"; now it means "yes, if there is a plausible
typofix for the command name, please run it immediately".

* sc/help-autocorrect-one:
  help: interpret boolean string values for help.autocorrect