[CF1] DEX overview fix

[deadlypants1973]

Summary

PCX-17708

Screenshots (optional)

Documentation checklist

• [ ] The documentation style guide has been adhered to.
• [ ] If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• [ ] Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated the DEX overview for clarity and improved readability.

• Revised the introduction to Digital Experience Monitoring (DEX) for better clarity.
• Separated the DEX title from the description for improved formatting.

Modified Files

• src/content/docs/cloudflare-one/insights/dex/index.mdx

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[github-actions[bot]]

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

Pattern	Owners
/src/content/docs/cloudflare-one/insights/dex/	@deadlypants1973, @cloudflare/pcx-technical-writing

[github-actions[bot]]

Preview URL: https://2cc6da0b.preview.developers.cloudflare.com Preview Branch URL: https://kate-fixes-dexoverview.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/insights/dex/	https://kate-fixes-dexoverview.preview.developers.cloudflare.com/cloudflare-one/insights/dex/