[BUGFIX] Allow span tags in fieldInformation return

To be able to improve the layout of field information, the span tag is
added to the list of allowed tags in html.

Resolves: #84633
Releases: master, 8.7
Change-Id: If3a60002cb8b7a7473e96820bdb35ac9c8111bab
Reviewed-on: https://review.typo3.org/56573


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Helmut Hummel <typo3@helhum.io>
Tested-by: Helmut Hummel <typo3@helhum.io>