Fix some XML docs inaccuracies

[martintmk]

Details on the issue fix or feature implementation

Contributes to #1091

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

Patch and project coverage have no change.

Comparison is base (49726ab) 83.99% compared to head (a8eb461) 83.99%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1592   +/-   ##
=======================================
  Coverage   83.99%   83.99%           
=======================================
  Files         280      280           
  Lines        6548     6548           
  Branches     1020     1020           
=======================================
  Hits         5500     5500           
  Misses        839      839           
  Partials      209      209           

Flag	Coverage Δ
linux	83.99% <ø> (ø)
macos	?
windows	83.99% <ø> (ø)

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Files Changed	Coverage Δ
...ependencyInjection/AddResiliencePipelineContext.cs	100.00% <ø> (ø)
...dencyInjection/PollyServiceCollectionExtensions.cs	100.00% <ø> (ø)
...ions/Registry/ConfigureBuilderContextExtensions.cs	100.00% <ø> (ø)

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