ci: fix markdown formatting for contributing.md to pass markdownlint

[richm]

fix markdown formatting for contributing.md to pass markdownlint

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

Documentation:

• Update CONTRIBUTING.md to adhere to markdownlint formatting rules

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Update contributing.md to align with markdownlint rules by refining headings, list structures, code fences, and whitespace/line breaks.

File-Level Changes

Change	Details	Files
Standardize heading formatting	Normalize heading levels Insert required blank lines before and after headings	contributing.md
Normalize list structures	Ensure a single space after list markers Apply consistent indentation for nested lists	contributing.md
Convert code snippets to fenced blocks	Switch inline code blocks to ``` fences with language tags Add blank lines surrounding each code block	contributing.md
Clean up whitespace and line breaks	Remove trailing spaces Wrap or break overly long lines to satisfy line-length lint rule	contributing.md

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[sourcery-ai]

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

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