RFR: 8255020: Minor updates to docs jdk.incubator.vector

[Erik Joelsson]

On Mon, 19 Oct 2020 18:41:31 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> Minor updates, with no specification changes, to the documentation of Vector API.
> 
> The compilation of the Vector module was updated to turn on doclint errors for >= protected documentation.

Build change looks ok.

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Marked as reviewed by erikj (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/746