node-SDK: Update hfc setDeployWaitTime description

The secs parameter is of type number.  It will accept
values that seem invalid but Node.js actually enforces
a minimum and maximum value in setTimeout, so any value
will work.  Need to make this clear in the documentation.
https://jira.hyperledger.org/browse/FAB-126

Change-Id: Ia3e99037df45476492f3792ed23ca154fed95903
Signed-off-by: Caroline Daughtrey <cdaughtr@us.ibm.com>

sdk/node/src/hfc.ts

@@ -552,6 +552,11 @@ export class Chain {
 
     /**
      * Set the deploy wait time in seconds.
+     * Node.js will automatically enforce a
+     * minimum and maximum wait time.  If the
+     * number of seconds is larger than 2147483,
+     * less than 1, or not a number,
+     * the actual wait time used will be 1 ms.
      * @param secs
      */
     setDeployWaitTime(secs:number):void {