Update Wireless Controller.cfg

# See libretro/RetroArch#6920
# RetroArch's in-app feature to create autoconfig files is flawed and will attempt to create the 2 lines :
#   input_l2_btn = "6"
#   input_r2_btn = "7"
# Those 2 lines are a downgrade from the 2 following lines which additionally allow l2/r2 to be polled as analog axes :

udev/Wireless Controller.cfg

@@ -19,6 +19,11 @@ input_a_btn = "1"
 input_x_btn = "2"
 input_l_btn = "4"
 input_r_btn = "5"
+# See https://github.com/libretro/RetroArch/issues/6920
+# RetroArch's in-app feature to create autoconfig files is flawed and will attempt to create the 2 lines :
+#   input_l2_btn = "6"
+#   input_r2_btn = "7"
+# Those 2 lines are a downgrade from the 2 following lines which additionally allow l2/r2 to be polled as analog axes :
 input_l2_axis = "+2"
 input_r2_axis = "+5"
 input_l3_btn = "11"