textops: update documentation for is_audio_on_hold()

(cherry picked from commit def7be2a3a60039c21c0711153152533b8ceb836)

src/modules/textops/doc/textops_admin.xml

@@ -1258,8 +1258,6 @@ if(has_body("application/sdp"))
 		<para>
 		The function returns <emphasis>true</emphasis> if the SIP message
 		has a body attached and at least one audio stream in on hold.
-		Only RFC2543 is supported (c=0.0.0.0).
-		Hold detection based on RFC3264 is not supported (a=sendonly/inactive).
 		</para>
 		<para>
 		This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,