Enhance title and intro for code blocks section

[BlackDadd77]

Refine the title and introduction for clarity on code block usage.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks.md

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[Copilot]

Pull request overview

This PR attempts to enhance the title and introduction for the code blocks documentation section. However, the change introduces a critical issue that breaks the file's YAML frontmatter.

Key Changes:

• Modified the opening YAML frontmatter delimiter on line 1

---

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[Copilot]

The frontmatter YAML header is malformed. Line 1 should be --- (three hyphens only) to properly open the YAML frontmatter block. The current value -and-highlighting-code-blocks.md--- will break the page rendering.

Suggested change

	-and-highlighting-code-blocks.md---
	---