JDK 9 RFR of JDK-8069262: Doclint regression in java.nio.channels.Channels

[Amy Lu]

Please review the fix for Doclint regression in 
java.nio.channels.Channels, removed the empty <p> tag.

bug: https://bugs.openjdk.java.net/browse/JDK-8069262
webrev: http://cr.openjdk.java.net/~amlu/8069262/webrev.00/
I also need a sponsor for this.

Thanks,
Amy