RFR: 8364317: Explicitly document some assumptions of StringUTF16 [v2]

[Chen Liang]

On Wed, 30 Jul 2025 12:07:32 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add paragraph for endianness and layout
>
> A good initiative, thanks @liach.
> Maybe some words about endianness would be useful as well.

@rgiulietti: I have added a paragraph describing the layout constraints of UTF16 byte arrays. Please check it out.

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PR Comment: https://git.openjdk.org/jdk/pull/26541#issuecomment-3136556023