templates: Update wording to be more prescriptive.

[alya]

Also remove "Hello"s.

Questions

1. Should we drop claimWarning and the logic around it? (I never see it in action.)
2. Why don't I ever see needsReviewWarning (which I'm not sure we need) and updateWarning?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.94%. Comparing base (d575a9e) to head (40153c5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   66.94%   66.94%           
=======================================
  Files          22       22           
  Lines        2063     2063           
  Branches      121      121           
=======================================
  Hits         1381     1381           
  Misses        680      680           
  Partials        2        2           

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[timabbott]

Merged, thanks @alya! I don't know the answers to either question, I guess we can discuss on chat.zulip.org.