RFR: Moving JEP 516 to Delivered

[María Arias de Reyna Domínguez]

Updating the list of delivered JEPs.

-------------

Commit messages:
 - Moving JEP 516 to Delivered

Changes: https://git.openjdk.org/leyden-docs/pull/5/files
  Webrev: https://webrevs.openjdk.org/?repo=leyden-docs&pr=5&range=00
  Stats: 3 lines in 1 file changed: 2 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/leyden-docs/pull/5.diff
  Fetch: git fetch https://git.openjdk.org/leyden-docs.git pull/5/head:pull/5

PR: https://git.openjdk.org/leyden-docs/pull/5