[BUGFIX] Fix command description

Due to using array_pop instead of array_shift the last line
of the command description is dropped instead of the first.

Use array_shift instead to get the full description
annotated for the command method.

Resolves: #59324
Releases: 6.2, 6.1, 4.7
Change-Id: I4d7c320b0ef334adbd15997d15d8e7a56d5739c1
Reviewed-on: https://review.typo3.org/30613
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel