[Docs] Fix calculation of exponential delay in flow chart

[janher]

Pull Request

The issue or feature being addressed

Documentation fix:

The exponential flow chart showed the delay calculation to be Delay * AttemptNumber^2, but it should be Delay * 2^AttemptNumber. e.g. when AttemptNumber is 3, the delay is multiplied by 8, not 9.

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

[janher]

@dotnet-policy-service agree company="VAA"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.64%. Comparing base (3336d1c) to head (fe30ff4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2005   +/-   ##
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  Coverage   83.64%   83.64%           
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  Files         312      312           
  Lines        7105     7105           
  Branches     1054     1054           
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  Hits         5943     5943           
  Misses        789      789           
  Partials      373      373           

Flag	Coverage Δ
linux	83.64% <ø> (ø)
macos	83.64% <ø> (ø)
windows	?

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