Fix grammar in entering_rcm.md

Changed "While holding the Volume Up button, press the Power button once while holding Volume Up." to "While holding the Volume Up button, press the Power button once."

Author: MokshC

docs/user_guide/rcm/entering_rcm.md

@@ -25,7 +25,7 @@ The order of methods on this page is in the order of ease. The easiest method to
 ## Instructions:
 
 1. Power off the Switch and short the pins on the right Joy-Con rail using one of the methods listed below.
-1. While holding the `Volume Up` button, press the `Power` button once while holding `Volume Up`.
+1. While holding the `Volume Up` button, press the `Power` button once.
     - If your Switch displays the Nintendo logo and boots normally (or the screen was on and goes black), you didn't successfully enter RCM and should try again. Otherwise, if your console still has a black screen (even after tapping the power button again), your Switch is in RCM and you can let go of the `Volume Up` button.
 1. Once your Switch is in RCM, remove the RCM jig (if applicable) and continue with the next page of the guide by clicking on the button at the bottom of this page.