Update src/com/xilinx/rapidwright/rwroute/RouteNodeType.java

Signed-off-by: eddieh-xlnx <eddie.hung@amd.com>

src/com/xilinx/rapidwright/rwroute/RouteNodeType.java

@@ -66,7 +66,7 @@ public enum RouteNodeType {
     /**
      * Denotes {@link RouteNode} objects that should be treated as being inaccessible and
      * never queued for exploration during routing. Typically, these are routing nodes that
-     * have already been created but later discovered to not be needed (e.g. is a dead-end node).
+     * have already been created but later discovered to not be needed (e.g. a dead-end node).
      */
     INACCESSIBLE;