Create v0.40.0 Doc branch

[multiphaseCFD]

Before submitting

Please complete the following checklist when submitting a PR:

• All new features must include a unit test.
  If you've fixed a bug or added code that should be tested, add a test to the
  tests directory!

• All new functions and code must be clearly commented and documented.
  If you do make documentation changes, make sure that the docs build and
  render correctly by running make docs.

• Ensure that the test suite passes, by running make test.

• Add a new entry to the .github/CHANGELOG.md file, summarizing the
  change, and including a link back to the PR.

• Ensure that code is properly formatted by running make format.

When all the above are checked, delete everything above the dashed
line and fill in the pull request template.

---

Context:

Description of the Change:

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit .github/CHANGELOG.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[LuisAlfredoNu]

LGTM!
Thank you @multiphaseCFD

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.36%. Comparing base (87619f9) to head (2a1488c).

Additional details and impacted files

@@             Coverage Diff             @@
##           v0.40.0_rc    #1034   +/-   ##
===========================================
  Coverage       27.36%   27.36%           
===========================================
  Files              29       29           
  Lines            2646     2646           
===========================================
  Hits              724      724           
  Misses           1922     1922           

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[josephleekl]

LGTM! Thanks @multiphaseCFD