[TASK] Reduce length of a very long .rst filename

To reduce headaches on windows, a very long filename
is shortened in length.

Change-Id: I53086fa0018b7628d13a7b1330685c0a4e2f0189
Resolves: #80028
Releases: master
Reviewed-on: https://review.typo3.org/51866


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: TYPO3com <no-reply@typo3.com>