[DOCS] Fix sitemap rendering in EXT:form documentation

Resolves: #97024
Releases: main, 11.5
Change-Id: If4b85ca494226fdd793af169c1e389e529e785b5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73655


Tested-by: core-ci <typo3@b13.com>
Tested-by: waldhacker <hello@waldhacker.dev>
Reviewed-by: waldhacker <hello@waldhacker.dev>

typo3/sysext/form/Documentation/Sitemap/Index.rst

-.. include:: /Includes.rst.txt
-
 :template: sitemap.html
 
-
 .. _Sitemap:
 
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