[Docs] Add minor tweaks to migration guide 1/3

[peter-csala]

Pull Request

The issue or feature being addressed

• Part 1: Review from Migrating execution policies till Migrating timeout policies
• Part 2: Add missing Migrating circuit breaker policies
• Part 3: Review from Migrating other policies till Interoperability between policies and resilience pipelines

Details on the issue fix or feature implementation

• Migrating execution policies
  • Reordered the interface list to align with code samples
  • Added line breaks to the V7's non-generic examples to have the same look and feel as the generic ones
  • Renamed the Execute{Async}'s CancellationToken parameter to token to avoid ambiguity
  • Renamed lambda function's r parameter to result to align with V8's sample
  • In case of V8 used static anonymous function whenever it is possible
  • Added important section at the end as a TL;DR + link for further info
• Migrating policy wrap
  • Added important section at the end as a TL;DR + link for further info
• Migrating retry policies
  • Fixed V7's code examples indentations
  • Moved and fixed the V7's Retry forever example
  • In case of V8 used static anonymous function whenever it is possible
  • Added important section at the end as a TL;DR + link for further info
• Migrating rate limit policies
  • Added important section at the end as a TL;DR + link for further info
• Migrating bulkhead policies
  • Fixed V7's code examples indentations to align with rate limiter examples
  • Added important section at the end as a TL;DR + link for further info
• Migrating timeout policies
  • Added important section at the end as a TL;DR + link for further info

Preview

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 ✅

Comparison is base (e404873) 84.53% compared to head (aa05cd7) 84.53%.
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   84.53%   84.53%           
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  Files         307      307           
  Lines        6777     6777           
  Branches     1043     1043           
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  Hits         5729     5729           
  Misses        839      839           
  Partials      209      209           

Flag	Coverage Δ
linux	84.53% <ø> (ø)
macos	84.53% <ø> (ø)
windows	?

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