Fix failing doc build

[daico007]

PR Summary:

Turn out, even though the docs build on readthedocs pass, some of the pages still failed to be built (but didn't error out). This PR will try to fix the remaining issue with the docs and addressed the issue raised in #1174.

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.28%. Comparing base (d9a9498) to head (7c5708d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1177   +/-   ##
=======================================
  Coverage   87.28%   87.28%           
=======================================
  Files          62       62           
  Lines        6502     6502           
=======================================
  Hits         5675     5675           
  Misses        827      827           

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