; Prepare to update ERC version to 5.5

; Prepare to update ERC version to 5.5

* doc/misc/erc.texi: Mention in various places that ERC is also
available from GNU ELPA.
* etc/ERC-NEWS: Mention Compat dependency and shorten title for
auth-source section.
* lisp/erc/erc-backend.el: (erc-server-reconnect-function,
erc-tags-format): Update package version to 5.5.
(erc--parse-message-tags): Downcase warning "type" to remain
consistent with all other ERC warnings.
* lisp/erc/erc-button.el: (erc-button-alist): Change package-version
to 5.5.
* lisp/erc/erc-match.el (erc-match-quote-when-adding): Update package
version to 5.5.
* lisp/erc/erc-sasl.el: Mention actual info node in Commentary.
(erc-sasl): Update package version to 5.5.
(erc-sasl-password): Reword doc string.
(erc-sasl-auth-source-function): Capitalize "info" in doc string.
* lisp/erc/erc-services.el (erc-auth-source-services-function): Update
package version to 5.5.  Capitalize "info" in doc string.  Change
choice type from const to function-item.
* lisp/erc/erc.el (erc-password): Capitalize "info" in doc string.
(erc-inhibit-multiline-input, erc-ask-about-multiline-input,
erc-prompt-hidden, erc-hide-prompt, erc-unhide-query-prompt,
erc-join-buffer, erc-reconnect-display, erc-kill-server-hook,
erc-kill-channel-hook, erc-kill-buffer-hook,
erc-url-connect-function): Update package version to 5.5.
(erc-auth-source-server-function, erc-auth-source-join-function):
Update package version to 5.5.  Change choice type from const to
function-item.  Capitalize "info" in doc string.
(erc-tls): Capitalize "info" in doc string.