Update ERC module URLs

Update ERC module URLs

* lisp/erc/erc-autoaway.el, lisp/erc/erc-button.el,
lisp/erc/erc-compat.el, lisp/erc/erc-fill.el, lisp/erc/erc-imenu.el,
lisp/erc/erc-join.el, lisp/erc/erc-lang.el, lisp/erc/erc-match.el,
lisp/erc/erc-pcomplete.el, lisp/erc/erc-ring.el,
lisp/erc/erc-spelling.el, lisp/erc/erc-stamp.el,
lisp/erc/erc-track.el: Update URL to friendlier form, over https.
* lisp/erc/erc-ibuffer.el: Remove URL to nonexistent page.
* lisp/erc/erc-list.el, lisp/erc/erc-log.el, lisp/erc/erc-notify.el,
lisp/erc/erc-replace.el, lisp/erc/erc-services.el,
lisp/erc/erc-sound.el, lisp/erc/erc-speedbar.el,
lisp/erc/erc-truncate.el: Add URL to corresponding EmacsWiki page.