Simplify wording further to indicate no testing other than at full RX…

…/TX bandwidth has been tested.

USER_MANUAL.md

@@ -259,10 +259,9 @@ As an aid to the above, FreeDV will show the current mode on the bottom of the w
 ## Transceiver Filters
 
 For most FreeDV use, your radio's receive and transmit filters should be set to the widest possible (typically around 3 KHz). 
-This allows easy switching between analog mode as well as the various FreeDV modes. Depending on your individual circumstances, 
-narrower receive filters may help with reception of FreeDV, but there has not been any testing to definitively confirm this or 
-under what circumatances (if any) where this would be the case. Additionally, FreeDV already performs its own transmit filtering,
-so using additional narrow filtering on the radio will likely have little benefit (again, untested).
+This allows easy switching between analog mode as well as the various FreeDV modes. There has not been any testing done to
+definitively confirm whether narrower bandwidths help with reception of FreeDV. Additionally, FreeDV already performs its own 
+transmit filtering, so using additional narrow filtering on the radio will likely have little benefit (again, untested).
 
 For reference, the channel widths of the currently supported modes are below: