[Thanatos9404]

Issue #, if available:

Fixes #4750

Description of changes:

DocumentDB Serverless instances use the db.serverless instance class (docs), but the Price List prices them by capacity unit, outside the Database Instance products the pricing script reads. So the class never reached the enum and E3620 rejected it in every region.

• scripts/update_specs_from_pricing.py: pass default=set(["db.serverless"]) for DocumentDB, the same way Add db.serverless to neptune instance classes #3009 did for Neptune.
• aws_docdb_dbinstance/dbinstanceclass_enum.json: add db.serverless to every region list, which is what the script now produces. I don't have Pricing API access, so the file was edited, not regenerated: one sorted line per region (34), nothing else changes.

AWS's Supported instance classes by Region table marks Serverless as supported in every DocumentDB Region, the same 34 Regions the enum lists, so the default applies to all of them, as it does for Neptune.

Tests: a new parametrized test for DBInstanceClassEnum (db.serverless in us-east-1 and il-central-1 as in the issue, plus a class DocumentDB doesn't offer and one missing from a region, which are still reported), and a test in test_update_specs_from_pricing.py that runs main() with mocked Price List pages and checks the DocumentDB output includes db.serverless. The db.serverless case and the main() test fail on main and pass with this change; the other three cases pass on both. The full test suite passes (Python 3.13), and pre-commit run on the changed files passes. No snapshot under test/fixtures/results is affected.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.66%. Comparing base (7e4b262) to head (deaac79).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4761   +/-   ##
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  Coverage   94.66%   94.66%           
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  Files         439      439           
  Lines       15963    15963           
  Branches     3091     3091           
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  Hits        15112    15112           
  Misses        468      468           
  Partials      383      383           

Flag	Coverage Δ
unittests	94.66% <ø> (ø)

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