Fix failing doctests

[agriyakhetarpal]

Description

A quick fix after #3074 and #3097 to declare the inheritance_diagram.py extension safe for parallel reads and writes, in order to suppress warnings that arise when running the doctests in the CI which are treated as errors.

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ pre-commit run (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python run-tests.py --all
• The documentation builds: $ python run-tests.py --doctest

You can run unit and doctests together at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5486fce) 99.71% compared to head (59fa13d) 99.71%.

❗ Current head 59fa13d differs from pull request most recent head beddc27. Consider uploading reports for the commit beddc27 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3123   +/-   ##
========================================
  Coverage    99.71%   99.71%           
========================================
  Files          248      248           
  Lines        18747    18747           
========================================
  Hits         18693    18693           
  Misses          54       54           

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[agriyakhetarpal]

All builds passed here: https://github.com/pybamm-team/PyBaMM/actions/runs/5492139377

[Saransh-cpp]

Thanks for the fix, @agriyakhetarpal! :)