Typo and docstring fixes.

Typo and docstring fixes.

* url.el (url-do-setup):
* url-dired.el (url-dired-minor-mode):
* url-file.el (url-file-find-possibly-compressed-file):
* url-gw.el (url-gateway-broken-resolution):
* url-handlers.el (url-handler-regexp):
* url-imap.el (url-imap-default-port):
* url-methods.el (url-scheme-get-property): Fix typos in docstrings.

* url-auth.el (url-basic-auth-storage, url-digest-auth):
  Fix typos in docstrings.
  (url-digest-auth-storage, url-register-auth-scheme): Reflow docstrings.

* url-cache.el (url-cache-prepare): Doc fix.
  (url-cache-create-filename-human-readable, url-cache-extract):
  Fix typos in docstrings.

* url-dav.el (url-intersection, url-dav-iso8601-regexp)
  (url-dav-delete-something): Fix typos in docstrings.
  (url-dav-http-success-p, url-dav-file-name-all-completions)
  (url-dav-directory-files, url-dav-file-name-completion): Doc fixes.

* url-http.el (url-http-idle-sentinel): Doc fix.

* url-irc.el (url-irc-default-port): Fix typo in docstring.
  (url-irc-function): Doc fix.

* url-util.el (url-get-url-filename-chars, url-unhex-string):
  Fix typos in docstrings.
  (url-file-extension): Doc fix.

* url-vars.el (url-current-object, url-current-mime-headers)
  (url-privacy-level, url-mail-command, url-mime-language-string):
  Fix typos in docstrings.
  (url-honor-refresh-requests): Reflow docstring.
  (url-using-proxy): Doc fix.