[Docs] Dispose registry which contains rate limiters

[peter-csala]

Pull Request

The issue or feature being addressed

• Does disposing a pipeline registry dispose chained limiters? #2425
• docs: dispose registry which contains rate limiters #2438

Details on the issue fix or feature implementation

Done

• Lift and shift (code sample and documentation fragment)
• Optimized the sample code a bit

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 96.23%. Comparing base (db5d21c) to head (4ee33bf).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2578   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files         311      311           
  Lines        7327     7327           
  Branches     1013     1013           
=======================================
  Hits         7051     7051           
  Misses        222      222           
  Partials       54       54           

Flag	Coverage Δ
linux	96.23% <ø> (ø)
macos	96.23% <ø> (ø)
windows	96.22% <ø> (ø)

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[martincostello]

Looks good - just a few minor suggested tweaks.