Update client.yml for clarity

Moves current item to free slot instead of deleting. If a free slot isn't available it drops the current item onto the ground then puts it in the user's hand.

client.yml

@@ -15,13 +15,11 @@
 # It offers ways to hide some laggy features in minecraft and thus simplify the game
 # for the players, while the server still works as normally.
 #
-# NOTE: THE CLIENT-SIDE TWEAKS SHOULD WORK ON 1.8-1.13.1, BUT SOME FUTURE VERSIONS
-#       MAY NOT WORK OUT OF THE BOX. PLEASE CONTACT US TO UPDATE THIS SYSTEM IF
-#       ANY PROBLEM ARISES.
+# NOTE: THE CLIENT-SIDE TWEAKS ONLY WORKS ON 1.8-1.13.1
 settings:
   # The client-side tweaks are currently experimental. They have been tested comprehensively,
   # but not against a large range of systems and minecraft versions. Please take care.
-  enabled: false
+  enabled: false # Only enable on 1.8-1.13.1!
   # Set the command that players will use to open the client-side optimizer.
   command: "optimize"
   # Set the permission required for players to be able to use the client optimizer.