Update go.php

This part was removed from the documentation:
nextcloud#431

I couldn't find any link to it in the current server-repository.

Signed-off-by: tflidd <[email protected]>

Author: tflidd

go.php

@@ -12,7 +12,6 @@
     'admin-code-integrity'    => '/admin_manual/issues/code_signing.html',
     'admin-config'            => '/admin_manual/configuration_server/config_sample_php_parameters.html',
     'admin-db-conversion'     => '/admin_manual/configuration_database/db_conversion.html',
-    'admin-dir_permissions'   => '/admin_manual/installation/installation_wizard.html#setting-strong-directory-permissions',
     'admin-email'             => '/admin_manual/configuration_server/email_configuration.html',
     'admin-encryption'        => '/admin_manual/configuration_files/encryption_configuration.html',
     'admin-external-storage'  => '/admin_manual/configuration_files/external_storage_configuration_gui.html',