float8 training: clean up recipe names

[vkuzo]

Summary:

Originally these recipe names were added with the intention of polishing
the API later. Later is now, this PR cleans up the names to make them
easier to understand.

Test Plan:

./test/float8/test_everything.sh

Reviewers:

Subscribers:

Tasks:

Tags:

[vkuzo]

Stack from ghstack (oldest at bottom):

• float8 training: add README.md entry for rowwise scaling #1733
• float8 training: make the "config from recipe" API polished #1731
• -> float8 training: clean up recipe names #1730

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1730

• 📄 Preview Python docs built from this PR

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 8da2519 with merge base 988c5c9 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run Float8 Tests / test (H100, linux.aws.h100, --pre torch torchvision torchaudio --index-url https://download.pytor... / linux-job (gh) (trunk failure)
  RuntimeError: Command

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