Update site_config.mdx

Author: mibali

docs/admin/config/site_config.mdx

@@ -201,7 +201,7 @@ All site configuration options and their default values are shown below.
 	// Disk usage threshold at which to display warning notification. Value is a percentage.
 	"gitserver.diskUsageWarningThreshold": 90,
 
-	// Configuration for logging and alerting, including to external s.
+	// Configuration for logging and alerting, including to external services.
 	"log": null,
 
 	// Notifications recieved from Sourcegraph.com to display in Sourcegraph.