[BUGFIX] Do not render coding hint in scheduler manual

The "Creating a new task" manual renders a coding hint on the top
due to invalid markup. Remove a duplicated line to fix this issue.

Resolves: #70119
Releases: master
Change-Id: I1aab10399597478989f11ad5244292a73853151c
Reviewed-on: http://review.typo3.org/43571


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>