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)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[gitguardian]

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

❗ 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

@@                         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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