PUBSUB HELP
Syntax
        PUBSUB HELP
- Available since:
 - 6.2.0
 - Time complexity:
 - O(1)
 - ACL categories:
 - 
              
                
@slow, 
The PUBSUB HELP command returns a helpful text describing the different subcommands.
Return
Array reply: a list of subcommands and their descriptions