RFR: 8257776: [valhalla:jep390] Add disclaimer about future changes to value-based classes [v2]

[Roger Riggs]

On Fri, 4 Dec 2020 21:45:36 GMT, Dan Smith <dlsmith at openjdk.org> wrote:

>> Addressing CSR feedback by mentioning the possibility of future behavioral changes to value-based classes.
>
> Dan Smith has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rephrase "future release" warning.

Marked as reviewed by rriggs (Reviewer).

src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/MemoryAddress.java line 44:

> 42:  * All implementations of this interface must be <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>;
> 43:  * programmers should treat instances that are {@linkplain #equals(Object) equal} as interchangeable and should not
> 44:  * use instances for synchronization, or unpredictable behavior may occur. For example, in a future release, synchronization may fail.

Add a line break before the new sentence and in MemoryLayout.java and MemorySegment.java

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PR: https://git.openjdk.java.net/valhalla/pull/294