[DOCS] Document `rawRecord` usage in fluid

Resolves: #104759
Releases: main
Change-Id: I57fdcacc75c3c2c7453ebbc484aef19d1135ae48
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85806


Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>