RFR: 8037384: Fix wording in Javadoc of java.io.Serializable [v2]

[Chris Hegarty]

On Thu, 19 Nov 2020 23:36:20 GMT, Stuart Marks <smarks at openjdk.org> wrote:

>> 8231547: Serializable class doc should link to serialization specification
>> 
>> Rewrite a couple confusing sentences in the Serializable class doc. This does affect normative text, but the edits are primarily to focus and clarify the text, not to make any semantic changes. Thus, a CSR request shouldn't be required for this change.
>> 
>> Also add and adjust some links and link markup to the Java Object Serialization Specification.
>
> Stuart Marks has updated the pull request incrementally with one additional commit since the last revision:
> 
>   non-serializable classes => non-serializable superclasses

LGTM.

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Marked as reviewed by chegar (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1306