chore(administration): Generate system config documentation from config.sample.php

Author: nextcloud-bot

admin_manual/configuration_server/config_sample_php_parameters.rst

@@ -4288,7 +4288,7 @@ files.chunked_upload.max_parallel_count
 
 Maximum number of chunks uploaded in parallel during chunked uploads. Higher
 counts increase throughput but consume more server resources, with diminishing
-returns.
+returns. Value must be a positive integer.
 
 Defaults to ``5``