[foreign-memaccess+abi] RFR: Add @apiNote to package-info

[Maurizio Cimadamore]

On Tue, 8 Nov 2022 13:43:09 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes an additional `@apiNote` saying native memory behaves differently that normal Java objects.

src/java.base/share/classes/java/lang/foreign/package-info.java line 218:

> 216:  * documented for methods of this API.
> 217:  *
> 218:  * @apiNote The normal Java Ojbect access control, guarantees and constraints, for example stated in

Suggestion:

 * @apiNote Usual memory model guarantees, for example stated in

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PR: https://git.openjdk.org/panama-foreign/pull/751