JSR310 serialization should be described in details

JSR310 serialization should be described in details. It uses 3 proxy Ser-classes, but all 3 these classes are package-private, thus they described only in Serialized Form. We need to ensure the fact that the Java SE 8 implementation provided by other vendors use the same mechanism and can deserialize class serialized using our implementation and vice versa.

The following information should be added to serialized-form.html:
1. Ser-files -- What is it?, Why do we need them? How does it work?
2. "dedicated serialized form" -- What does it mean?
3. All classes in java.time.chrono and java.time.zone should contain links to corresponding Ser-classes and should contain term "dedicated serialized form".