docs: fix touch_data typo

[ikrommyd]

Just a random typo I found while I went to read the documentation of this function.

[github-actions]

The documentation preview is ready to be viewed at http://preview.awkward-array.org.s3-website.us-east-1.amazonaws.com/PR3641

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.67%. Comparing base (b749e49) to head (875ee76).
⚠️ Report is 424 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/awkward/typetracer.py	87.87% <ø> (-1.19%)	⬇️

... and 196 files with indirect coverage changes

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