Please review a trivial doc-only change to fix 3 missing doc comments detected by doclint. The new comments do not add any semantically new or interesting information, so no CSR.
For the javac case, a preferable solution would have been to remove the undocumented `throws Exception`, except that would be an incompatible signature change for anyone unlikely enough to be calling the method directly. For now, the `throws` is just documented, even though in practice the exception will never be thrown. -- Jon JBS: https://bugs.openjdk.java.net/browse/JDK-8247382 Webrev: http://cr.openjdk.java.net/~jjg/8247382/webrev.00/
