hg: jdk/sandbox: http-client-branch: API note about sendPong

[chris.hegarty at oracle.com]

Changeset: 857421616455
Author:    chegar
Date:      2018-03-21 17:10 +0000
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/857421616455

http-client-branch: API note about sendPong

! src/java.net.http/share/classes/java/net/http/WebSocket.java