Some documentation related files contain a UTF-8 BOM
while they shouldn't.
Usually, script Build/Scripts/checkUtf8Bom.sh tests
for this in CI. The script however fails in CI
currently, since the PHP test container doesn't have
gnu file shell command installed. Seems nobody saw
the according error message and due to the xargs
construct the test does not fail.

Change-Id: I557c7ec84b61badfcd74a20063baf29eaf9f0959
Resolves: #93397
Releases: master, 10.4, 9.5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67588
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>