fix(optimization_tutorial): bullet list indentation in colab

[ribhuji]

Fixes #3939

Description

Bullet lists under "Hyperparameters", "Optimization Loop", and "Inside the training loop" sections in optimization_tutorial.py were rendering as inline text or blockquotes in the generated Jupyter notebook.

Root cause: Two issues in the sphinx-gallery to pypandoc pipeline:

1. The list items used # - (3 spaces after #). After sphinx-gallery strips # , the dash was not at column 0, causing pandoc to treat the list as a block quote.
2. There was no blank line between the preceding paragraph and the list, so pandoc joined everything into one run-on sentence.

Fix: Changed the indentation to # - (dash at column 0 after stripping) and added a blank # line before each list — matching the convention used by dozens of other tutorials in this repo.

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

Testing

1. Built the tutorial locally

GALLERY_PATTERN="optimization_tutorial.py" sphinx-build -D plot_gallery=0 -b html . _build/html

2. Uploaded _build/html/_downloads/.../optimization_tutorial.ipynb to Colab.

Colab link - https://colab.research.google.com/drive/1pTyCPUD8WJmRs1x54V2GpF4c2ke1DlQf?usp=sharing

SS

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3940

• 📄 Preview Python docs built from this PR

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

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[ribhuji]

@sekyondaMeta @svekars please do look at this minimal change.

Tagging acc to this - https://docs.pytorch.org/docs/main/community/persons_of_interest.html#docs-tutorials