docs: add pyproject section in examples

[radoering]

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code.

I received feedback that it is difficult to see which section an attribute belongs to unless you have just navigated there by clicking on a link on the left-hand side and still remember. Since we have already included the section in some examples, let's do it consistently for all of them.

Summary by Sourcery

Clarify pyproject.toml documentation examples by consistently including their corresponding configuration sections.

Documentation:

• Add explicit [project] and [tool.poetry] headers (with ellipsis placeholders where needed) to pyproject.toml example snippets to show which section each key belongs to.
• Correct phrasing from "An URL" to "A URL" in deprecated homepage, repository, and documentation option descriptions.

[sourcery-ai]

Reviewer's Guide

Standardizes TOML snippets in the pyproject configuration docs by explicitly including their corresponding [project] or [tool.poetry] section headers, and fixes minor wording in URL-related descriptions.

File-Level Changes

Change	Details	Files
Clarify section context in pyproject TOML examples by adding explicit table headers.	Prefixed project-related snippets with a [project] table header, using '# ...' where needed to indicate omitted keys. Prefixed Poetry tool configuration snippets with a [tool.poetry] table header, using '# ...' where needed to indicate omitted keys. Ensured consistency of section headers across all documented keys for both PEP 621 project metadata and [tool.poetry] configuration.	docs/pyproject.md
Improve wording consistency in URL field descriptions.	Changed 'An URL' to 'A URL' in homepage, repository, and documentation field descriptions while keeping deprecation notes for project.urls intact.	docs/pyproject.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[github-actions]

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