Fix Timeout's TimeoutGenerator documentation

[peter-csala]

Pull Request

The issue or feature being addressed

#2266

Details on the issue fix or feature implementation

• Fixed documentation comment
• Enhanced timeout documentation
• Added test case when TimeoutGenerator is null

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.33%. Comparing base (1aece4e) to head (31c47b7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2275   +/-   ##
=======================================
  Coverage   85.33%   85.33%           
=======================================
  Files         313      313           
  Lines        7444     7444           
  Branches     1122     1122           
=======================================
  Hits         6352     6352           
  Misses        746      746           
  Partials      346      346           

Flag	Coverage Δ
linux	85.33% <ø> (ø)
macos	85.33% <ø> (ø)
windows	85.33% <ø> (ø)

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[martincostello]

Thanks again!