docs: mention AWS_ENDPOINT_URL_DYNAMODB

[maxitg]

Description

Document AWS_ENDPOINT_URL_DYNAMODB in storage_options, as it's not obvious that it's separate and not inferred from AWS_ENDPOINT_URL.

Related Issue(s)

• feature implemented in feat: add custom dynamodb endpoint configuration #2575
• feat: override dynamodb config #3011 documents this too, so feel free to close if/when it gets merged.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.40%. Comparing base (cd9c9d5) to head (0dd7889).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3021      +/-   ##
==========================================
- Coverage   72.41%   72.40%   -0.01%     
==========================================
  Files         128      128              
  Lines       40859    40859              
  Branches    40859    40859              
==========================================
- Hits        29586    29585       -1     
+ Misses       9361     9358       -3     
- Partials     1912     1916       +4     

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