Update & simplify PR template formatting / language.

[zaneselvans]

PR Overview

• Comment out explanatory text so it doesn't gum up the PR.
• Shorten bullets and format so they don't look janktastic.

PR Checklist

• Merge the most recent version of the branch you are merging into (probably dev).
• Make sure you've included good docstrings.
• For major data coverage & analysis changes, run data validation tests
• Include unit tests for new functions and classes.
• Defensive data quality/sanity checks in analyses & data processing functions.
• Update the release notes and reference reference the PR and related issues.
• Do your own explanatory review of the PR to help the reviewer understand what's going on and identify issues preemptively.
• All CI checks are passing. Run tests locally to debug failures

[codecov]

Codecov Report

Base: 85.2% // Head: 85.2% // No change to project coverage 👍

Coverage data is based on head (f978556) compared to base (2e8fa5b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2181   +/-   ##
=====================================
  Coverage   85.2%   85.2%           
=====================================
  Files         73      73           
  Lines       8555    8555           
=====================================
  Hits        7290    7290           
  Misses      1265    1265           

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