[Several] Updates 1xxx links

[angelampcosta]

Summary

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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 several links related to Cloudflare error codes for consistency and accuracy across documentation.

• Corrected links for error codes 1010, 1001, 1000, and 1020 to point to the updated URLs.
• Ensured all references to error codes are consistent throughout the documentation.
• Improved clarity by updating documentation related to DNS resolution and firewall rules.

Modified Files

• src/content/docs/analytics/account-and-zone-analytics/threat-types.mdx
• src/content/docs/dns/troubleshooting/dns-issues.mdx
• src/content/docs/load-balancing/pools/cloudflare-pages-origin.mdx
• src/content/docs/rules/custom-errors/example-rules.mdx
• src/content/docs/ssl/reference/certificate-and-hostname-priority.mdx
• src/content/docs/support/troubleshooting/http-status-codes/4xx-client-error.mdx
• src/content/docs/waf/reference/migration-guides/firewall-rules-to-custom-rules.mdx
• src/content/docs/workers/platform/known-issues.mdx

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[github-actions]

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

Pattern	Owners
/src/content/docs/analytics/	@jimhawkridge, @soheiokamoto, @angelampcosta, @cloudflare/pcx-technical-writing
/src/content/docs/dns/	@RebeccaTamachiro, @cloudflare/pcx-technical-writing
/src/content/docs/load-balancing/	@angelampcosta, @cloudflare/pcx-technical-writing
/src/content/docs/rules/	@pedrosousa, @cloudflare/pcx-technical-writing
/src/content/docs/ssl/	@RebeccaTamachiro, @cloudflare/pcx-technical-writing
/src/content/docs/support/	@zeinjaber, @TracyCloudflare, @ngayerie, @cloudflare/pcx-technical-writing, @cloudflare/customer-support
/src/content/docs/waf/	@pedrosousa, @cloudflare/firewall, @cloudflare/pcx-technical-writing
/src/content/docs/workers/platform/	@irvinebroque, @GregBrimble, @cloudflare/deploy-config, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://da14ecf6.preview.developers.cloudflare.com
Preview Branch URL: https://angela-update-links.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/analytics/account-and-zone-analytics/threat-types/	https://angela-update-links.preview.developers.cloudflare.com/analytics/account-and-zone-analytics/threat-types/
https://developers.cloudflare.com/dns/troubleshooting/dns-issues/	https://angela-update-links.preview.developers.cloudflare.com/dns/troubleshooting/dns-issues/
https://developers.cloudflare.com/load-balancing/pools/cloudflare-pages-origin/	https://angela-update-links.preview.developers.cloudflare.com/load-balancing/pools/cloudflare-pages-origin/
https://developers.cloudflare.com/rules/custom-errors/example-rules/	https://angela-update-links.preview.developers.cloudflare.com/rules/custom-errors/example-rules/
https://developers.cloudflare.com/ssl/reference/certificate-and-hostname-priority/	https://angela-update-links.preview.developers.cloudflare.com/ssl/reference/certificate-and-hostname-priority/
https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/	https://angela-update-links.preview.developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/
https://developers.cloudflare.com/waf/reference/migration-guides/firewall-rules-to-custom-rules/	https://angela-update-links.preview.developers.cloudflare.com/waf/reference/migration-guides/firewall-rules-to-custom-rules/
https://developers.cloudflare.com/workers/platform/known-issues/	https://angela-update-links.preview.developers.cloudflare.com/workers/platform/known-issues/