Update model doc

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (5832009) 14.65% compared to head (83993ce) 13.94%.

Files	Patch %	Lines
...ataAndStorage/ModelData/State/ObservedObject.swift	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8 +/- ## ========================================== - Coverage 14.65% 13.94% -0.71% ========================================== Files 135 132 -3 Lines 1842 1785 -57 ========================================== - Hits 270 249 -21 + Misses 1572 1536 -36 ```

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