RFR: Markdown anchors

[Magnus Ihse Bursie]

On Fri, 29 May 2020 11:50:04 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> Found how to do link anchors in markdown. Added anchors in the glossary as well. Also changed to short hash in the
> footer, the long hash took over the whole page in the final published version.

Marked as reviewed by ihse (no project role).

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PR: https://git.openjdk.java.net/guide/pull/13