[amber-docs] RFR: Updated list of delivered JEPs [v2]

[Gavin Bierman]

> JEP 420 has been delivered

Gavin Bierman has refreshed the contents of this pull request, and previous commits have been removed. Incremental views are not available.

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Changes:
  - all: https://git.openjdk.java.net/amber-docs/pull/13/files
  - new: https://git.openjdk.java.net/amber-docs/pull/13/files/eab5f421..83e606de

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=amber-docs&pr=13&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=amber-docs&pr=13&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/amber-docs/pull/13.diff
  Fetch: git fetch https://git.openjdk.java.net/amber-docs pull/13/head:pull/13

PR: https://git.openjdk.java.net/amber-docs/pull/13