[wiki] Transfer gems transferrer / transferee object type clarification

Author: FreddyMSchubert

wiki/reference/actions/core_action_transferGems.md

@@ -16,8 +16,10 @@ If the position points to an object that can hold gems (Cores / Units / Gem Pile
 
 Only units are able to drop gems on the floor.
 
-- Units can only transfer gems if their action cooldown is 0, for more see [Cooldowns](documentation/cooldowns).
-- Units can only transfer gems one tile up, down, left or right; for more see [Action Position Limits](documentation/action_position_limits). The only exception to this is outlined in the tip box below.
+- Objects can only transfer gems if their action cooldown is 0, for more see [Cooldowns](documentation/cooldowns).
+- Objects can only transfer gems one tile up, down, left or right; for more see [Action Position Limits](documentation/action_position_limits). The only exception to this is outlined in the tip box below.
+
+The transferring object must be a Core or Unit of your team, and the target object must be a Core or Unit of any team, a Gem Pile, or an empty grid position.
 
 > [!TIP]
 > Unlike other action parameters, the server won't stop executing the transfer gems action if the gems amount parameter is set higher than the possible amount. That means you can pass `99999`, even if the source object is only holding `42` gems, to transfer the maximum possible amount of gems anyways.