Fix typos.

Fix typos.

* lisp/replace.el (query-replace, occur-read-regexp-defaults-function)
  (replace-search):
* lisp/subr.el (declare-function, number-sequence, local-set-key)
  (substitute-key-definition, locate-user-emacs-file)
  (with-silent-modifications, split-string, eval-after-load):
  Fix typos, remove unneeded backslashes and reflow some docstrings.