Refine DNS documentation and FAQs

[hyperlint-ai]

This pull request addresses various style guide violations, including incorrect casing, spelling errors, and punctuation issues in the documentation. The changes enhance clarity and ensure compliance with the established style guide.

• Updated casing for 'Wrangler' in multiple files to comply with style guide rules (browse-the-web.mdx, configuration.mdx, rag.mdx, using-ai-models.mdx)
• Corrected spelling errors such as 'capabilties' to 'capabilities' and 'disconecting' to 'disconnecting' in relevant files (rag.mdx, using-ai-models.mdx)
• Removed end punctuation from headings to align with style guide requirements in several files (faq.mdx, websockets.mdx, etc.)
• Revised unclear antecedents in sentences for better clarity in the documentation (faq.mdx, extended-dns-error-codes.mdx)
• Standardized quotes to avoid non-standard quote usage in multiple files.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/1.1.1.1/	@RebeccaTamachiro, @cloudflare/pcx-technical-writing
/src/content/docs/agents/	@irvinebroque, @rita3ko, @elithrar, @thomasgauvin, @threepointone, @cloudflare/pcx-technical-writing