remove obsolete encoding headers

[partev]

header "# -- coding: utf-8 --" is only needed for Python 2.x.

Since Python 3.x default encoding is utf-8 and coding header is not necessary.

this patch removes those headers not to confuse newcomers

cc @svekars @sekyondaMeta @AlannaBurke

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3366

• 📄 Preview Python docs built from this PR

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

❌ 1 New Failure, 1 Cancelled Job

As of commit 1d18970 with merge base ab2aafd ():

NEW FAILURE - The following job has failed:

• link check on PR / linkChecker (gh)
  Process completed with exit code 1.

CANCELLED JOB - The following job was cancelled. Please retry:

• Build tutorials / pytorch_tutorial_build_manager (gh)

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[github-actions]

Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as stale.
Feel free to remove the stale label if you feel this was a mistake.
If you are unable to remove the stale label please contact a maintainer in order to do so.
If you want the bot to never mark this PR stale again, add the no-stale label.
stale pull requests will automatically be closed after 30 days of inactivity.