Improve output readability for LocalPathsInGemfile

This hook had too long of a description which would cause the output
appear misaligned with other hooks. Shorten the description to fix it.

Change-Id: I6823ace349e06507d29ef6aaab379d49f09ae7f8
Reviewed-on: http://gerrit.causes.com/44652
Tested-by: jenkins <jenkins@brigade.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>