RFR: Publish: Thoughts on Training Runs

[Dan Heidinga]

Publish the writeup on training runs

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Commit messages:
 - Fix date tag
 - Tweak formatting
 - Initial writeup of the team's discussions on training runs

Changes: https://git.openjdk.org/leyden-docs/pull/3/files
  Webrev: https://webrevs.openjdk.org/?repo=leyden-docs&pr=3&range=00
  Stats: 131 lines in 1 file changed: 131 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/leyden-docs/pull/3.diff
  Fetch: git fetch https://git.openjdk.org/leyden-docs.git pull/3/head:pull/3

PR: https://git.openjdk.org/leyden-docs/pull/3