Update javadoc as per review

Signed-off-by: Eddie Hung <eddie.hung@amd.com>

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

@@ -331,8 +331,8 @@ private static ClockRegion findCentroid(Net clk, Device device) {
     }
 
     /**
-     * Routes a static net (GND or VCC).
-     * @param pins A list of static pins to be routed.
+     * Routes pins from a static net (GND or VCC).
+     * @param pins A list of static pins to be routed (must all be on the same net).
      * @param getNodeState Lambda to get a node's status (available, unavailable, already in-use).
      * @param design The {@link Design} instance to use.
      * @param routeThruHelper The {@link RouteThruHelper} instance to use.