mr-template: wrap the instructions inside a comment block
At least in preview mode, this hides the text so the user doesn't have to delete
it. It's still visible in edit mode, so the user sees it.
--- a/.gitlab/merge_request_templates/Default.md Wed Oct 19 11:50:40 2022 -0400
+++ b/.gitlab/merge_request_templates/Default.md Wed Oct 19 11:10:54 2022 -0400
@@ -1,5 +1,8 @@
/assign_reviewer @mercurial.review
+
+<!--
+
Welcome to the Mercurial Merge Request creation process:
* Set a simple title for your MR,
@@ -11,3 +14,5 @@
* https://www.mercurial-scm.org/wiki/ContributingChanges
* https://www.mercurial-scm.org/wiki/Heptapod
+
+-->