Docs tweaks.

Author: johnbillion

.github/workflows/upgrade-testing.yml

@@ -175,8 +175,9 @@ jobs:
   # The oldest version of WordPress receiving security updates should always be tested against
   # the widest possible list of PHP/MySQL combinations.
   #
-  # WordPress 4.6, 4.7, and 4.8 cannot run on PHP 8 due to the use of __autoload().
-  # See https://core.trac.wordpress.org/ticket/36926 and https://core.trac.wordpress.org/ticket/40109.
+  # WordPress 4.7 is excluded from PHP 8+ testing because of the following fatal errors:
+  # - Use of __autoload().
+  # - array/string offset with curly braces.
   upgrade-tests-oldest-wp-mysql:
     name: ${{ matrix.wp }} to ${{ inputs.new-version && inputs.new-version || 'latest' }}
     uses: ./.github/workflows/reusable-upgrade-testing.yml