[code-reflection] RFR: [docs][hat] Notes for building and running with the CUDA backend [v2]

[Juan Fumero]

> This PR extends the documentation for HAT to dispatch with the CUDA backend on NVIDIA GPUs.

Juan Fumero has updated the pull request incrementally with one additional commit since the last revision:

  [docs][hat] Add missing cuda docs

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Changes:
  - all: https://git.openjdk.org/babylon/pull/503/files
  - new: https://git.openjdk.org/babylon/pull/503/files/0d77e95d..f491b341

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=503&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=503&range=00-01

  Stats: 69 lines in 1 file changed: 69 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/503.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/503/head:pull/503

PR: https://git.openjdk.org/babylon/pull/503