Fix description on configChannels.sh

The last commit uses pv_name without $, so the resulted file
was invalid. This change fix this and set the description to
original PV, this ensure the description will be set right even
when alias is the same as channel.

startup/configChannels.sh

@@ -74,7 +74,7 @@ do
     fi
 
     # set descriptions
-    echo "$template1\"A=$LLRF_IOC_NAME:pv_name, D=$desc\")" >> $fPathDesc
+    echo "$template1\"A=$LLRF_IOC_NAME$iNum:AI$ch, D=$desc\")" >> $fPathDesc
 
 done
 } < $confFile