deprecate 4 year old name and note. (#20908)

Removed the old names from the title, and moved the note from the top to after the description. I am fine removing the note altogether, but it might not be time yet.

files/en-us/web/css/_colon_is/index.md

@@ -1,5 +1,5 @@
 ---
-title: ':is() (:matches(), :any())'
+title: ':is()'
 slug: Web/CSS/:is
 tags:
   - ':is'
@@ -14,10 +14,10 @@ browser-compat: css.selectors.is
 
 {{CSSRef}}
 
-> **Note:** `:matches()` was renamed to `:is()` in [CSSWG issue #3258](https://github.com/w3c/csswg-drafts/issues/3258).
-
 The **`:is()`** [CSS](/en-US/docs/Web/CSS) [pseudo-class](/en-US/docs/Web/CSS/Pseudo-classes) function takes a selector list as its argument, and selects any element that can be selected by one of the selectors in that list. This is useful for writing large selectors in a more compact form.
 
+> **Note:** Originally named `:matches()` (and `:any()`), this selector was renamed to `:is()` in [CSSWG issue #3258](https://github.com/w3c/csswg-drafts/issues/3258).
+
 {{EmbedInteractiveExample("pages/tabbed/pseudo-class-is.html", "tabbed-shorter")}}
 
 Pseudo-elements are not valid in the selector list for `:is()`.