[valhalla-docs] RFR: Add Brian Goetz presentation from July 2024

[Andrew Byrd]

Looking into the present state of project Valhalla, I found a very good presentation from July of 2024 at https://inside.java/tag/valhalla that was not listed on the page at https://openjdk.org/projects/valhalla/ but seems to fit well alongside the other presentations listed there.

I updated the page to include this presentation from Brian Goetz. I also sorted the presentations in reverse chronological order, as some of the information in this 2024 presentation seems to supersede previous ones.

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Commit messages:
 - Add Brian Goetz presentation (July 2024)

Changes: https://git.openjdk.org/valhalla-docs/pull/13/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla-docs&pr=13&range=00
  Stats: 6 lines in 1 file changed: 4 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/valhalla-docs/pull/13.diff
  Fetch: git fetch https://git.openjdk.org/valhalla-docs.git pull/13/head:pull/13

PR: https://git.openjdk.org/valhalla-docs/pull/13