amazon documentdb storage adapter guide

[cprendergast19]

Added guide to creating a keyv instance using a DocumentDB storage adapter

Please check if the PR fulfills these requirements

• Followed the Contributing guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (2fa48f3) compared to base (c98328c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #587   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           21        21           
  Lines         2332      2332           
=========================================
  Hits          2332      2332           

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