Add documentation to ProtobufMessage

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 21.94%. Comparing base (c9a742f) to head (1cb5a8d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...penSwiftUICore/Data/Protobuf/ProtobufMessage.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #148      +/-   ##
==========================================
- Coverage   21.96%   21.94%   -0.03%     
==========================================
  Files         232      232              
  Lines        7351     7351              
==========================================
- Hits         1615     1613       -2     
- Misses       5736     5738       +2     

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