Fix typos.

Fix typos.

* etc/srecode/el.srt: Fix typo.

* lisp/allout.el (allout-init, allout-prefixed-keybindings)
  (allout-unprefixed-keybindings):
* lisp/progmodes/prolog.el (prolog-find-term):
  Fix typos in docstrings.

* lisp/org/org.el (org-blank-before-new-entry, org-context-in-file-links)
  (org-refile-targets, org-log-repeat, org-insert-link)
  (org-speed-command-default-hook, org-speed-command-hook)
  (org-in-regexps-block-p, org-yank-generic, org-goto-first-child):
  Fix typos in docstrings.
  (org-toggle-pretty-entities): Fix typo in message.