docs(pull_request_template): add task to fix broken external links in the docs

[bearomorphism]

Description

Make the following change in PR template:

- [ ] Check and fix any broken links (internal or external) in the documentation

Checklist

• I have read the contributing guidelines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.62%. Comparing base (120d514) to head (d41674c).
Report is 657 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1487      +/-   ##
==========================================
+ Coverage   97.33%   97.62%   +0.28%     
==========================================
  Files          42       57      +15     
  Lines        2104     2653     +549     
==========================================
+ Hits         2048     2590     +542     
- Misses         56       63       +7     

Flag	Coverage Δ
unittests	97.62% <ø> (+0.28%)	⬆️

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