[docs] Add warnings to latest minors relating to MDL-87892

Author: mickhawkins

general/releases/4.5/4.5.9.md

@@ -12,6 +12,10 @@ import { ReleaseNoteIntro } from '@site/src/components/ReleaseInformation';
 
 <ReleaseNoteIntro releaseName={frontMatter.moodleVersion} />
 
+:::warning Important 4.5.9 upgrade notice
+Please note that sites using third party themes that modify the core admin renderer (such as <!-- cspell:disable -->Moove<!-- cspell:enable -->) are recommended **not** to upgrade to this minor version, as there is a known breaking change which affects access to site administration. Sites using Boost, Classic or other themes which do not modify site administration rendering are not affected, and it is safe to upgrade (for more information, see MDL-87892). An unscheduled release which addresses this bug will be released imminently.
+:::
+
 ## General fixes and improvements
 <!-- cspell:disable -->
 - [MDL-87356](https://moodle.atlassian.net/browse/MDL-87356) - Orphaned random questions should be deleted

general/releases/5.0/5.0.5.md

@@ -12,6 +12,10 @@ import { ReleaseNoteIntro } from '@site/src/components/ReleaseInformation';
 
 <ReleaseNoteIntro releaseName={frontMatter.moodleVersion} />
 
+:::warning Important 5.0.5 upgrade notice
+Please note that sites using third party themes that modify the core admin renderer (such as <!-- cspell:disable -->Moove<!-- cspell:enable -->) are recommended **not** to upgrade to this minor version, as there is a known breaking change which affects access to site administration. Sites using Boost, Classic or other themes which do not modify site administration rendering are not affected, and it is safe to upgrade (for more information, see MDL-87892). An unscheduled release which addresses this bug will be released imminently.
+:::
+
 ## General fixes and improvements
 <!-- cspell:disable -->
 - [MDL-51447](https://moodle.atlassian.net/browse/MDL-51447) - Hidden activities are listed on the completion progress details page

general/releases/5.1/5.1.2.md

@@ -12,6 +12,10 @@ import { ReleaseNoteIntro } from '@site/src/components/ReleaseInformation';
 
 <ReleaseNoteIntro releaseName={frontMatter.moodleVersion} />
 
+:::warning Important 5.1.2 upgrade notice
+Please note that sites using third party themes that modify the core admin renderer (such as <!-- cspell:disable -->Moove<!-- cspell:enable -->) are recommended **not** to upgrade to this minor version, as there is a known breaking change which affects access to site administration. Sites using Boost, Classic or other themes which do not modify site administration rendering are not affected, and it is safe to upgrade (for more information, see MDL-87892). An unscheduled release which addresses this bug will be released imminently.
+:::
+
 ## General fixes and improvements
 <!-- cspell:disable -->
 - [MDL-51447](https://moodle.atlassian.net/browse/MDL-51447) - Hidden activities are listed on the completion progress details page