Fix Hideshow key binding typo in Emacs manual

* doc/emacs/programs.texi (Hideshow): Add missing function and key
index entries.  Fix hs-toggle-hiding binding typo. (bug#35798)
1 job for emacs-26 in 27 minutes and 8 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #1832
test

00:27:08