Normalize @since tag to use consistent format for JDK to @since 1.n[.n]

Under most circumstances, this should be @since 1.n as public APIs should not change during a major(spec) release.

We found exceptions before 1.1, where we would have the second version, such 1.0.2.

Note that some API use a standard, such as SAX or JCE along with the standard version, those are reserved for now.