docs: update docs around disable_gpu change.

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Updates docs after #1559.

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.47%. Comparing base (6b0a285) to head (6e87fcf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1562      +/-   ##
==========================================
+ Coverage   41.45%   41.47%   +0.02%     
==========================================
  Files         114      114              
  Lines       17837    17838       +1     
==========================================
+ Hits         7394     7399       +5     
+ Misses      10443    10439       -4     

Flag	Coverage Δ
macos-12	36.72% <100.00%> (+<0.01%)	⬆️
ubuntu-latest	43.45% <100.00%> (+0.02%)	⬆️
windows-2019	36.93% <100.00%> (+<0.01%)	⬆️

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