RFR: 8277475: Update JDK_DOCS property to point to JDK 17 docs

Tue Nov 30 18:14:08 UTC 2021

On Tue, 30 Nov 2021 15:58:17 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> We are still pointing to the JDK 12 API docs when building the JavaFX docs. This PR updates the build to point to the JDK 17 API docs.

This works and it is a good fix.
Out of interest, I wonder if the entry in the verification-metadata matters.
I modified the sha256 value in the verification metadata to a wrong value, but it still works. 
(modifying the URL for JavaSE 17 broke the process).

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Marked as reviewed by jvos (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/686