feat(developer): Document hash validate method

Signed-off-by: Christopher Ng <[email protected]>

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst

@@ -183,8 +183,9 @@ Added APIs
 - ``OCP\AppFramework\Bootstrap\IRegistrationContext::registerTaskProcessingProvider()`` was added to allow registering task processing providers
 - ``OCP\AppFramework\Bootstrap\IRegistrationContext::registerTaskProcessingTaskType()`` was added to allow registering task processing task types
 - ``OCP\Files\IRootFolder::getAppDataDirectoryName()`` was added to allow getting the name of the app data directory
-- ``OCP\AppFramework\Http\JSONResponse()`` constructor now supports passing additional ``json_encode`` flags, see https://www.php.net/manual/en/function.json-encode.php for details
 - ``OCP\Console\ReservedOptions`` was added and contains constants for options reserved for occ core features. ``--debug-log`` and ``--debug-log-level`` are now reserved by occ as they allow to show debug information to the output on any occ command.
+- ``OCP\Security\IHasher::validate()`` should return true if the passed string is a valid hash generated by ``OCP\Security\IHasher::hash()``
+- ``OCP\AppFramework\Http\JSONResponse()`` constructor now supports passing additional ``json_encode`` flags, see https://www.php.net/manual/en/function.json-encode.php for details
 
 Changed APIs
 ^^^^^^^^^^^^