Fix Retry strategy ShouldHandle in example code

[marcrocny]

Pull Request

The issue or feature being addressed

The existing example compiles, but incorrectly shows the ShouldHandle delegate as operating on an Exception object.

Details on the issue fix or feature implementation

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
• N/A, doc only I have included unit tests for the issue/feature
• N/A, doc only I have successfully run a local build

[marcrocny]

@dotnet-policy-service agree

[martincostello]

Thanks for the PR.

You'll need to change the code in the Snippets, which are used to generate the docs, otherwise the changes will get overwritten.

Once you've done that the docs can be regenerated with:

dotnet tool restore
dotnet mdsnippets

[marcrocny]

@martincostello Thanks for the pointer, good to go now?

[martincostello]

Looks like the snippet doesn't compile because it raises a nullability warning.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.23%. Comparing base (3fb0897) to head (a1cb5f3).
Report is 35 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2527   +/-   ##
=======================================
  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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