Fix code formatting for data capture getting started

[utzcoz]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Straightforward changes for documentation format, so it doesn't attach any issue.

Description

Mkdocs doesn't support fenced code block in number list,
so this CL changes number list to unordered lists and
removes indent for fenced code block to make it work.

This Cl also fixes running error of build-docs.bash on Ubuntu 22.04 that I faced
by updating setuptools before building mkdocs.

Alternative(s) considered
Not.

Type
Documentation

Screenshots (if applicable)

Checklist

• I have read and acknowledged the Code of conduct.
• I have read the Contributing page.
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA.
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project.
• I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally.
• I have built and run the demo app(s) to verify my change fixes the issue and/or does not break the demo app(s).