LPD-69624 Display optional arg in help text for list command

Author: anthony-chu

scripts/cli/lec.sh

@@ -112,7 +112,7 @@ _printHelpAndExit() {
 		  stop                             Stop a Composer project
 		  clean                            Stop a Composer project and remove Docker volumes
 		  exportData                       Export container data for a Composer project
-		  list                             List entities of a various types
+		  list [<entity>]                  List entities of a various types
 		  remove                           Completely tear down and remove one or more Composer projects
 		  share [--export]                 Save a Composer workspace for sharing. The "--export" flag exports the container data before saving the workspace.
 		  update [--unstable]              Check for updates to Composer and lec. The "--unstable" flag updates to latest master branch.