docs: for pull #594, fixed 2 outdated doc(s)

[joggrbot]

✨ Autofixed 2 outdated doc(s)

This pull was automatically generated by Joggr to fix 2 outdated doc(s) due to code changes in pull #594

Fixed docs

The following docs were fixed:

• docs/api/quota.md: The documentation was outdated because it omitted the newly-added 'Feature' type for resource registration, which is now a valid registration type with unique semantics. All locations describing valid types, measurement types, or the table entry were updated to include a clear explanation of Feature and its behavior.
• test/quota/registration-validation/README.md: Documentation is outdated because a significant validation scenario—the creation and validation of a 'Feature' type ResourceRegistration—was added to tests and type enums but was not reflected in the test case matrix or steps in the README. I've inserted this missing scenario in both the test listing and detailed test description sections.

How to fix

To fix the docs, you can either:

1. Merge this pull request into your pull request to fix the docs
2. Wait for your pull request to be merged and then merge this pull request into your base branch

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