[documentation] Add stopping conditions for CG

[amontoison]

Reference: #552

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.69%. Comparing base (9536ef7) to head (ef97466).
⚠️ Report is 119 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1070      +/-   ##
==========================================
+ Coverage   94.68%   97.69%   +3.01%     
==========================================
  Files          45       50       +5     
  Lines        8027    10011    +1984     
==========================================
+ Hits         7600     9780    +2180     
+ Misses        427      231     -196     

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