Update limits.mdx

It's tied to the zone plan default, but is controlled by Maximum Upload size so it can be lower if the setting is modified

Author: seaneustace

src/content/docs/workers/platform/limits.mdx

@@ -35,7 +35,7 @@ URLs have a limit of 16 KB.
 
 Request headers observe a total limit of 32 KB, but each header is limited to 16 KB.
 
-Cloudflare has network-wide limits on the request body size. This limit is tied to your Cloudflare account's plan, which is separate from your Workers plan. When the request body size of your `POST`/`PUT`/`PATCH` requests exceed your plan's limit, the request is rejected with a `(413) Request entity too large` error.
+Cloudflare has network-wide limits on the request body size. This limit is tied to your Cloudflare zone's plan (Maximum Upload Size), which is separate from your Workers plan. When the request body size of your `POST`/`PUT`/`PATCH` requests exceed your plan's limit, the request is rejected with a `(413) Request entity too large` error.
 
 Cloudflare Enterprise customers may contact their account team or [Cloudflare Support](/support/contacting-cloudflare-support/) to have a request body limit beyond 500 MB.