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Update OAuth docs page: fix method names and response shape
The OAuth flows documentation contains outdated code samples that reference a non-existent method `getUserGrants()`, pass a positional string to `revokeGrant()`, and show an incorrect flat response shape. Actual SDK uses `listGrants()`, `revokeGrant({ clientId })`, and nested OAuthGrant type with `granted_at`. Following the docs leads to runtime TypeErrors and undefined fields.