Remove all occurences of @brief and @returns from PHPDoc

apps/files/tests/ajax_rename.php

apps/files_encryption/ajax/adminrecovery.php

apps/files_encryption/ajax/changeRecoveryPassword.php

apps/files_encryption/ajax/getMigrationStatus.php

apps/files_encryption/ajax/updatePrivateKeyPassword.php

apps/files_encryption/ajax/userrecovery.php

apps/files_encryption/hooks/hooks.php

apps/files_encryption/lib/crypt.php

apps/files_encryption/lib/helper.php

apps/files_encryption/lib/keymanager.php

apps/files_encryption/lib/proxy.php

apps/files_encryption/lib/session.php

apps/files_encryption/lib/stream.php

apps/files_encryption/lib/util.php

apps/files_encryption/tests/crypt.php

apps/files_encryption/tests/hooks.php

apps/files_encryption/tests/proxy.php

apps/files_encryption/tests/share.php

apps/files_encryption/tests/stream.php

apps/files_encryption/tests/trashbin.php