doc: Add examples for frozenset and tuple settings

[sgaist]

This merge request adds examples for frozen sets and tuple settings for .isort.cfg and pyproject.toml .

Part of #1729

[codecov]

Codecov Report

Merging #1822 (3c9573b) into main (80c213b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1822   +/-   ##
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  Coverage   99.89%   99.89%           
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  Files          38       38           
  Lines        2975     2975           
  Branches      707      707           
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  Hits         2972     2972           
  Misses          1        1           
  Partials        2        2           

[timothycrosley]

Sorry for the delay in merging this! The reality is, that this is produced by a script, so I've had to take your updates and move them into the script. I'm going to merge this and see if the same results are produced

[sgaist]

No worries !

I completely missed that there's a script handling that.

Is it build_config_option_docs.py that I should have edited ?