Replace RST code directives with markdown code blocks

[joamatab]

Summary

• Replace .. code:: and .. code-block:: python RST directives with markdown triple-backtick code blocks in docstrings
• ASCII art diagrams and code examples were not rendering correctly with the new docs theme because it expects markdown, not RST

Test plan

• Verify docs build correctly
• Check ASCII art diagrams render properly in the docs

Summary by Sourcery

Documentation:

• Replace reStructuredText code-block directives in docstrings with Markdown triple-backtick code fences for proper rendering in the docs theme.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Converts an RST code-block directive in a docstring to a markdown-style fenced code block so that documentation renders correctly with the new markdown-oriented docs theme.

File-Level Changes

Change	Details	Files
Update a docstring example from an RST code-block directive to a fenced markdown code block for compatibility with the docs theme.	Replace the .. code-block:: python directive with a ```python fenced code block opener in the docstring. Wrap the existing example code in closing triple backticks to complete the markdown code fence.	sky130/tech.py

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[sourcery-ai]

Hey - I've left some high level feedback:

• The opening and closing ```python fences are indented inside the docstring, which some markdown/Sphinx renderers treat differently than top-level fences; consider unindenting the fences to column 0 (while leaving the code body indented) for more robust rendering across tools.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The opening and closing ```python fences are indented inside the docstring, which some markdown/Sphinx renderers treat differently than top-level fences; consider unindenting the fences to column 0 (while leaving the code body indented) for more robust rendering across tools.

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[gemini-code-assist]

Code Review

This pull request updates the docstring in sky130/tech.py by replacing a Sphinx-style .. code-block:: python directive with standard markdown code block backticks. There are no review comments to address, and I have no additional feedback to provide.