Update javadoc about meaning of zero timeout

Author: peterdettman

tls/src/main/java/org/bouncycastle/tls/DTLSRecordLayer.java

@@ -288,6 +288,9 @@ public int receive(byte[] buf, int off, int len, int waitMillis)
         return receive(buf, off, len, waitMillis, null);
     }
 
+    /**
+     * A waitMillis of zero is interpreted as an infinite timeout.
+     */
     int receive(byte[] buf, int off, int len, int waitMillis, DTLSRecordCallback recordCallback)
         throws IOException
     {

tls/src/main/java/org/bouncycastle/tls/DTLSTransport.java

@@ -31,6 +31,9 @@ public int receive(byte[] buf, int off, int len, int waitMillis)
         return receive(buf, off, len, waitMillis, null);
     }
 
+    /**
+     * A waitMillis of zero is interpreted as an infinite timeout.
+     */
     public int receive(byte[] buf, int off, int len, int waitMillis, DTLSRecordCallback recordCallback)    
         throws IOException
     {

tls/src/main/java/org/bouncycastle/tls/DatagramReceiver.java

@@ -6,5 +6,8 @@ public interface DatagramReceiver
 {
     int getReceiveLimit() throws IOException;
 
+    /**
+     * A waitMillis of zero is interpreted as an infinite timeout.
+     */
     int receive(byte[] buf, int off, int len, int waitMillis) throws IOException;
 }