added doc comments to builder properties where their were missing

[milyin]

Minor documentation updates
Fixes #2235

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.69%. Comparing base (420df8c) to head (525d6f6).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
zenoh/src/api/builders/publisher.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2234      +/-   ##
==========================================
- Coverage   71.80%   71.69%   -0.12%     
==========================================
  Files         376      376              
  Lines       61013    61016       +3     
==========================================
- Hits        43810    43743      -67     
- Misses      17203    17273      +70     

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