RFR: 4842457: (bf spec) Clarify meaning of "(optional operation)" [v3]

[Alan Bateman]

On Tue, 21 Mar 2023 19:34:28 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Add some clarifying verbiage about optional operations to the type-specific buffer classes.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   4842457: Remove vestigial comma; clean up

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13123#pullrequestreview-1351315477