[DOCS] Fix TypoScript in ViewHelper docs

Replace `:ts:` with ``:typoscript:` in
ViewHelper class comments. `:ts` does not
render properly, see for example
https://docs.typo3.org/other/typo3/view-helper-reference/main/en-us/typo3/fluid/latest/CObject.html

Resolves: #99068
Releases: main, 11.5
Change-Id: Idfac843859a5e9054e6e48f29b19616b2b956dac
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76562


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Lina Wolf <112@linawolf.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Chris Müller <typo3@krue.ml>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Lina Wolf <112@linawolf.de>