Added additional reference to wifi switch

Added another reference to the wifi switch at this stage because many people don't notice the alert on the 2.1 CTRtransfer and don't realize their wifi is off until trying to access the web browser on 2.1.

_pages/en_US/Installing-arm9loaderhax.txt

@@ -96,6 +96,7 @@ During this process, we also setup programs such as the following:
     + If you get the error "This service is not available in your region", use the System Settings to set your device's country to match the NAND region you installed with 2.1.0 ctrtransfer
     + If you get another error, [follow this troubleshooting guide](troubleshooting#ts_browser)
     + If you get a glitched screen, [follow this troubleshooting guide](troubleshooting#ts_safe_a9lh_screen)
+    + If your wifi switch is off, unplug the 3DS and remove the battery for several seconds to enable wifi
   + Press (Select) to Full Install
   + The installer will now install arm9loaderhax on your device (this is very fast)
   + Shut down your console, hold the power button until it turns off if necessary