adding explain notes for requirements

[Borda]

What does this PR do?

Add clarification/explanation to each requirement file so we keep it in mind

Before submitting

• Was this discussed/approved via a GitHub issue? (not for typos and docs)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• Did you list all the breaking changes introduced by this pull request?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

PR review

Anyone in the community is welcome to review the PR.
Before you start reviewing, make sure you have read the review guidelines. In short, see the following bullet-list:

• Is this pull request ready for review? (if not, please submit in draft mode)
• Check that all items from Before submitting are resolved
• Make sure the title is self-explanatory and the description concisely explains the PR
• Add labels and milestones (and optionally projects) to the PR so it can be classified

Did you have fun?

Make sure you had fun coding 🙃

cc @Borda @rohitgr7

[codecov]

Codecov Report

Merging #13872 (fcc2697) into master (5f1cb91) will increase coverage by 6%.
The diff coverage is n/a.

❗ Current head fcc2697 differs from pull request most recent head 6f26d0c. Consider uploading reports for the commit 6f26d0c to get more accurate results

@@            Coverage Diff             @@
##           master   #13872      +/-   ##
==========================================
+ Coverage      80%      86%      +6%     
==========================================
  Files         103      333     +230     
  Lines        6833    26159   +19326     
==========================================
+ Hits         5446    22492   +17046     
- Misses       1387     3667    +2280