Fix rapid7#6247, Update Meterpreter Usage on "Interact"

The "interact" command does not actually exist. Instead, users
should do "channel -i" to interact with a channel.

Fix rapid7#6247

Author: wchen-r7

lib/rex/post/meterpreter/ui/console/command_dispatcher/core.rb

@@ -49,10 +49,9 @@ def commands
       "?"          => "Help menu",
       "background" => "Backgrounds the current session",
       "close"      => "Closes a channel",
-      "channel"    => "Displays information about active channels",
+      "channel"    => "Displays information or control active channels",
       "exit"       => "Terminate the meterpreter session",
       "help"       => "Help menu",
-      "interact"   => "Interacts with a channel",
       "irb"        => "Drop into irb scripting mode",
       "use"        => "Deprecated alias for 'load'",
       "load"       => "Load one or more meterpreter extensions",