Improve merge request workflow docs to reflect title limit
Problem to solve
This is a follow up from this Danger message in a MR.
The pipeline Danger checks fail because of:
🚫 The merge request title may not be longer than 72 characters. For more information, take a look at our Commit message guidelines.
However, those MR guidelines don't mention any limit to the MR title.
Further details
This is the error from the Danger checks:
And this screenshot is taken from the MR Workflow guidelines:
Proposal
Add a limit instruction for the MR title in the merge_request_workflow.md file:
1. The MR title should describe the change you want to make.
+ 1. The MR title may not be longer than 72 characters.
1. The MR description should give a reason for your change.