[Docs] Update Encoder docs about multiple encoders (qmk#16036)

docs/feature_encoders.md

@@ -132,7 +132,10 @@ The A an B lines of the encoders should be wired directly to the MCU, and the C/
 
 ## Multiple Encoders
 
-Multiple encoders may share pins so long as each encoder has a distinct pair of pins. 
+Multiple encoders may share pins so long as each encoder has a distinct pair of pins when the following conditions are met:
+- using detent encoders
+- pads must be high at the detent stability point which is called 'default position' in QMK
+- no more than two encoders sharing a pin can be turned at the same time 
 
 For example you can support two encoders using only 3 pins like this
 ```