Mention that merge requests are welcome on git hook page

from dev issue: https://dev.gitlab.org/cookbooks/chef-repo/issues/322#note_60823

see title.

Milestone changed to 8.3

Milestone changed to 8.6

Milestone changed to 8.7

Milestone changed to 8.8

Milestone changed to %8.9

Removed frontend label

Milestone changed to %8.10

Added ~360296 label

We welcome merge requests to add additional git hooks.

That line ^ on the git hooks page, somewhere in a light grey color.

@JobV is this issue still valid?

@vsizov I think it's clear that we both accept MRs and feature requests for this and other things. Neither did we receive many new requests for git hooks. I think we leave this out.

Status changed to closed