Pool/SNOW-1337069 pool docs

[sfc-gh-mhofman]

Description

New connection pool documentation.

Checklist

• [ ] Code compiles correctly
• [ ] Code is formatted according to Coding Conventions
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing (dotnet test)
• [x] Extended the README / documentation, if necessary
• [x] Provide JIRA issue id (if possible) or GitHub issue id in PR name

[gitguardian[bot]]

️✅ There are no secrets present in this pull request anymore.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.28%. Comparing base (fe51400) to head (fa11555).

:exclamation: Current head fa11555 differs from pull request most recent head c1204e5. Consider uploading reports for the commit c1204e5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## pool/SNOW-860872-connection-pool #938 +/- ## ==================================================================== - Coverage 85.32% 85.28% -0.05% ==================================================================== Files 106 106 Lines 10660 10635 -25 Branches 1023 1019 -4 ==================================================================== - Hits 9096 9070 -26 - Misses 1318 1319 +1 Partials 246 246 ```

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