Drop superfluous versionadded for outdated versions (#1708) (#1717)

Releases: main, 13.4, 12.4
(cherry picked from commit f3bac8d)

Co-authored-by: Chris Müller <2566282+brotkrueml@users.noreply.github.com>

Author: typo3-docs-backport-bot[bot]

Documentation/PageTsconfig/Rte.rst

@@ -511,8 +511,6 @@ HTMLparser_db
 Sanitization
 ^^^^^^^^^^^^
 
-..  versionadded:: 9.5.29/10.4.19
-
 An HTML sanitizer is available to sanitize and remove XSS from markup. It
 strips tags, attributes and values that are not explicitly allowed.