Summary
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Address the "no comment" warnings in `java.net` generated by javadoc -Xdoclint

Problem
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`java.net` contains several classes such as `java.net.HttpRetryException` containing fields and/or methods which are missing a javadoc comment.

Solution
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Add the missing comments to the appropriate fields and methods in java.net.

Specification
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A patch and a zip containing the webrev and the generated serial form doc will attached to this CSR before finalization. 

For convenience the webrev & serialized form page can also be browsed online here:
[http://cr.openjdk.java.net/~dfuchs/webrev_8253100.00/index.html][1]


  [1]: http://cr.openjdk.java.net/~dfuchs/webrev_8253100.00/index.html