[9] RFR 8180635: (doc) Clarify the compatibility and interoperability issue when using provider default values

[Valerie Peng]

Sean,

Can you please review this javadoc-only changes for JDK 9?

Bug: https://bugs.openjdk.java.net/browse/JDK-8180635
Webrev: http://cr.openjdk.java.net/~valeriep/8180635/webrev.00/

Thanks,
Valerie