[DOCS] Document multiple --task options for scheduler

Document change "Feature: #87451 - scheduler:run command accepts
multiple task options".

The scheduler command now accepts multiple --task options.

Resolves: #90394
Releases: master
Change-Id: Ie0f7973cab01db88f4df0cb4cd87a194bf4914b1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63270


Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>