[8] Request for Review: Fix doclint accessibility issues in java.io

[Jason Uh]

Hi Joe,

Could I please get a review of this change? This changeset fixes doclint 
issues in java.io.

Webrev: http://cr.openjdk.java.net/~juh/8020426/webrev.02/

Changes have been checked with specdiff.

Thanks,
Jason