[DOCS] Remove outdated note in fluid_styled_content

The note about jumping to a previous version of the
page is obsolete, because you can switch no further
than version 8.7 with the version selector and the
older version is in v7.6.

In any case, if someone needs the information for
version 7.6 and below they must use other means
anyway (e.g. use Git repository and render locally)
since these older versions are no longer rendered
on docs.typo3.og.

Resolves: #97632
Releases: main, 11.5, 10.4
Change-Id: Iedbb482c4086ed4740410acc3c6e82f47607ec52
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74686


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>