TYPO3 Core

The current state of the documentation is outdated in some areas

• It shows CKEditor 4 screenshots
• It refers to CKEditor 4 (example: https://docs.typo3.org/c/typo3/cms-rte-ckeditor/main/en-us/Introduction/Index.html)
• The section "How do I add Custom Plugins?" is outdated, since plugin registration changed in v12. Also editor.externalPlugins is not used to register plugins any more.
• It should be checked, if the linked (https://docs.typo3.org/c/typo3/cms-rte-ckeditor/main/en-us/Configuration/Examples.html#configuration-using-the-toolbargroups-method) toolbar configurator is available for CKEditor 5 too (it currently covers CKEditor 4)