fix version wrangling in docs

[pmeier]

We have some logic in our docs that handles the version wrangling for released versions:

vision/docs/source/conf.py

Lines 96 to 105 in abc40ef

	# The short X.Y version.
	version = "main (" + torchvision.__version__ + " )"
	# The full version, including alpha/beta/rc tags.
	release = "main"
	VERSION = os.environ.get("VERSION", None)
	if VERSION:
	# Turn 1.11.0aHASH into 1.11 (major.minor only)
	version = ".".join(version.split(".")[:2])
	html_title = " ".join((project, version, "documentation"))
	release = version

Two issues here:

1. To enable the wrangling, we need to set the VERSION environment value. That is currently not the case.
2. The logic is broken. Since we wrangle after we have already prefixed the version with main(, this is retained for the final version.

This PR fixes both issues. I'll send a follow-up PR to the gh-pages branch to remediate this for the past two versions.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/7600

• 📄 Preview Python docs built from this PR

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❌ 6 New Failures

As of commit 196346a:

NEW FAILURES - The following jobs have failed:

• python-types / linux-job (gh)
• unittests-linux (3.8, linux.12xlarge, cpu) / linux-job (gh)
• unittests-macos (3.8, macos-12) / macos-job (gh)
• unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)
• unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
• unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)

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[NicolasHug]

Thanks a lot for fixing this Philip, this has been a bit of a pain to manually clean that after every release (and we often forget). This is mostly a stamp but if there's any issue they'll be easy to address

[github-actions]

Hey @pmeier!

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