Issue #1123 datasets doc improvement

[lulmer]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (please add here)

Please link to any issues this PR addresses.
#1123

Changelog

What are the changes made in this PR?

This PR adds more details for

• the datasets tutorial, especially for newcomers that are not aware that huggingface datasets handle local datasets too.
• the api doc of instruct_template with suggested explanation from @ebsmothers in issue #1099

Test plan

Please make sure to do each of the following if applicable to your PR. (If you're not sure about any one of these just ask and we will happily help.)

• building and checking doc rendering

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1134

• 📄 Preview Python docs built from this PR

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

❌ 2 New Failures, 3 Cancelled Jobs, 7 Pending

As of commit 47dddb3 with merge base 6f37d15 ():

NEW FAILURES - The following jobs have failed:

• Lint / lint (3.10) (gh)
  Process completed with exit code 1.
• Recipe Tests / recipe_test (3.11) (gh)
  tests/recipes/test_eleuther_eval.py::TestEleutherEval::test_torchtune_checkpoint_eval_results

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Recipe Tests / recipe_test (3.10) (gh)
  ##[error]The operation was canceled.
• Recipe Tests / recipe_test (3.8) (gh)
  ##[error]The operation was canceled.
• Recipe Tests / recipe_test (3.9) (gh)
  ##[error]The operation was canceled.

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