Adds note about max upload size

[angelampcosta]

Summary

Adds note about max upload size. Recreates #22485

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

Howdy and thanks for contributing to our repo. The Cloudflare team reviews new, external PRs within two (2) weeks. If it's been two weeks or longer without any movement, please tag the PR Assignees in a comment.

We review internal PRs within 1 week. If it's something urgent or has been sitting without a comment, start a thread in the Developer Docs space internally.

---

PR Change Summary

Added information regarding the maximum upload size in relevant documentation sections.

• Included a note about reducing the maximum upload size from the zone's Network page.
• Updated the troubleshooting guide to mention the impact of maximum upload size on error 413.

Modified Files

• src/content/docs/cache/concepts/default-cache-behavior.mdx
• src/content/docs/support/troubleshooting/http-status-codes/4xx-client-error/error-413.mdx

---

How can I customize these reviews?

Check out the Hyperlint AI Reviewer docs for more information on how to customize the review.

If you just want to ignore it on this PR, you can add the hyperlint-ignore label to the PR. Future changes won't trigger a Hyperlint review.

Note specifically for link checks, we only check the first 30 links in a file and we cache the results for several hours (for instance, if you just added a page, you might experience this). Our recommendation is to add hyperlint-ignore to the PR to ignore the link check for this PR.

[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, @cloudflare/pcx-technical-writing
/src/content/docs/support/	@zeinjaber, @TracyCloudflare, @ngayerie, @cloudflare/pcx-technical-writing, @cloudflare/customer-support

[github-actions]

Preview URL: https://3d9b4474.preview.developers.cloudflare.com
Preview Branch URL: https://duncan-cloudflare-production.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cache/concepts/default-cache-behavior/	https://duncan-cloudflare-production.preview.developers.cloudflare.com/cache/concepts/default-cache-behavior/
https://developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-413/	https://duncan-cloudflare-production.preview.developers.cloudflare.com/support/troubleshooting/http-status-codes/4xx-client-error/error-413/