DOC-2270: Add improved documentation for TINY-10474 in TinyMCE 7.0 release notes (#3147)

Co-authored-by: Mitchell Crompton <mitchell.crompton@tiny.cloud>

modules/ROOT/pages/7.0-release-notes.adoc

@@ -277,6 +277,9 @@ These custom tooltips appear on both mouse hover and keyboard focus, ensuring al
 [NOTE]
 Interactive elements with visible labels do not display custom tooltips, and the browser native tooltips have been removed, as the visible label provides sufficient information.
 
+[TIP]
+The `max-width` of the tooltips is set to `15em`, to overwrite the default `max-width` of the tooltips, update the `@tooltip-max-width` variable in your custom skin.
+
 === Added custom tooltip for `autocompleter`, now visible on both mouse hover and keyboard focus, except single column cases.
 // #TINY-9638