Add python version in building from source page

[mergennachin]

No description provided.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9975

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

⏳ No Failures, 2 Pending

As of commit a798b3d with merge base a238d6a ():
💚 Looks good so far! There are no failures yet. 💚

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[mergennachin]

@pytorchbot cherry-pick --onto release/0.6 -c

[pytorch-bot]

❌ 🤖 pytorchbot command failed:

@pytorchbot cherry-pick: error: argument -c/--classification: expected one argument

usage: @pytorchbot cherry-pick --onto ONTO [--fixes FIXES] -c
                               {regression,critical,fixnewfeature,docs,release}

Try @pytorchbot --help for more info.

[mergennachin]

@pytorchbot cherry-pick --onto release/0.6 -c docs

[pytorchbot]

Cherry picking #9975

The cherry pick PR is at #10058 The following tracker issues are updated:

• [v0.6.0] Release Tracker #9253 (comment)

Details for Dev Infra team

Raised by workflow job