[Cache] ELI5: Simplify cache-rules examples and fix cookie name bug

[Oxyjun]

Summary

Apply ELI5 analysis to 12 example files in docs/cache/how-to/cache-rules/examples/. 9 files changed, 3 needed no changes.

Key fixes

• bypass-cache-on-cookie.mdx: Cookie name mismatch — prose said test_cookie (underscore) but Expression Builder/Editor both use test-cookie (hyphen). Fixed to test-cookie.
• cache-deception-armor.mdx: Added cross-link to the cache deception attacks concept page — the term was used without definition or link.
• cache-everything.mdx: Fixed misindented admonition closing tag that could cause rendering issues.
• edge-ttl.mdx: Removed tautological phrasing (edge cache TTL for caching resources on Cloudflare edge).

Consistency fixes across 5 files

• Fixed description fields that duplicated the title verbatim
• Normalized list markers (asterisk to dash) for consistency with sibling files
• Added missing semicolons to import statements

[github-actions]

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

Pattern	Owners
/src/content/docs/cache/	@angelampcosta, @dcpena, @cloudflare/pcx-technical-writing, @cloudflare/product-owners

[github-actions]

Preview URL: https://71543102.preview.developers.cloudflare.com
Preview Branch URL: https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/origin-cache-control/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/origin-cache-control/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/query-string-sort/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/query-string-sort/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/respect-strong-etags/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/respect-strong-etags/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/cache-everything/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/cache-everything/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/bypass-cache-on-cookie/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/bypass-cache-on-cookie/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/cache-deception-armor/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/cache-deception-armor/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/browser-cache-ttl/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/browser-cache-ttl/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/cache-device-type/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/cache-device-type/
https://developers.cloudflare.com/cache/how-to/cache-rules/examples/edge-ttl/	https://jun-cache-how-to-cache-rules-examples-eli5.preview.developers.cloudflare.com/cache/how-to/cache-rules/examples/edge-ttl/