Fix docblock to reflect POST and PUT support in API key validation

[Copilot]

The docblock for _gutenberg_connectors_rest_settings_dispatch() stated validation runs on "POST requests", but the implementation checks for both POST and PUT methods.

Changes

• lib/experimental/connectors/default-connectors.php: Updated the docblock to read "On POST or PUT requests" to match the actual $is_update condition:

// Before
* On POST requests, validates each updated key against the provider before
* masking. If validation fails, the key is reverted to an empty string.

// After
* On POST or PUT requests, validates each updated key against the provider
* before masking. If validation fails, the key is reverted to an empty string.

---

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