add config parameter sample

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

config/config.sample.php

@@ -1232,6 +1232,24 @@ $CONFIG = array(
  */
 'sharing.minSearchStringLength' => 0,
 
+/**
+ * Collaboration
+ *
+ * Global settings for collaboration
+ */
+
+/**
+ * Defines the maximum number of auto complete results. The default is 50. This
+ * is used by the auto complete backend, which for example is consumed by
+ * auto completion feature in comments.
+ *
+ * It may look similar to sharing.maxAutocompleteResults, but there are some key
+ * differences in utilization. Thus, an unlimited default is very bad. Also,
+ * does not control the number of displayed results, but results fetched from
+ * each user backend. A small number is crucial for performance and a positive
+ * user experience.
+ */
+'collaboration.maxAutocompleteResults' => 50,
 
 /**
  * All other configuration options