docs: Add otter state generation doc

[poulok]

Fixes #20283

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff            @@
##               main   #21798   +/-   ##
=========================================
  Coverage     71.86%   71.86%           
  Complexity    24610    24610           
=========================================
  Files          2666     2666           
  Lines        103917   103917           
  Branches      10870    10870           
=========================================
  Hits          74681    74681           
  Misses        25206    25206           
  Partials       4030     4030           

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6355be6)	103822	78666	75.77%
Head commit (e2acdf5)	103822 (+0)	78666 (+0)	75.77% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#21798)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[netopyr]

LGTM - thanks @poulok