Add API note to ToolProvider about minimal supported options

Consider adding something like the following to java.util.spi.ToolProvider

    @apiNote
    Tools are encouraged but not required to support `--help` and `--version`
    options, which write to the standard output stream that is provided when
    invoking the `run` method.

Related JEP: https://openjdk.java.net/jeps/293
Related issues: TBD