Improve documentation

[martintmk]

Details on the issue fix or feature implementation

Just fixing some XML docs.

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

Merging #1487 (720677c) into main (d72ae6c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1487   +/-   ##
=======================================
  Coverage   83.71%   83.71%           
=======================================
  Files         272      272           
  Lines        6424     6424           
  Branches     1012     1012           
=======================================
  Hits         5378     5378           
  Misses        837      837           
  Partials      209      209           

Flag	Coverage Δ
linux	?
macos	83.71% <ø> (ø)
windows	83.71% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...itBreaker/CircuitBreakerStrategyOptions.TResult.cs	100.00% <ø> (ø)
...y.Core/Fallback/FallbackStrategyOptions.TResult.cs	100.00% <ø> (ø)
...lly.Core/Hedging/HedgingStrategyOptions.TResult.cs	100.00% <ø> (ø)
...c/Polly.Core/Retry/RetryStrategyOptions.TResult.cs	100.00% <ø> (ø)
src/Polly.Core/Timeout/TimeoutStrategyOptions.cs	100.00% <ø> (ø)
...c/Polly.RateLimiting/RateLimiterStrategyOptions.cs	100.00% <ø> (ø)