[Cache] Update default-cache-behavior.mdx

https://developers.cloudflare.com/support/troubleshooting/http-status-codes/2xx-success/#206-partial-content

Author: nenizera

src/content/docs/cache/concepts/default-cache-behavior.mdx

@@ -33,7 +33,7 @@ When [Origin Cache Control](/cache/concepts/cache-control/) is enabled on an Ent
 
 Clients can send range requests to be served from the cache using the `Range` header. Note that:
 
- - If the origin response includes a `Content-Length` header, then the specified byte range will be returned with an HTTP 206 response.
+ - If the origin response includes a `Content-Length` header, then the specified byte range will be returned with an [HTTP 206](/support/troubleshooting/http-status-codes/2xx-success/#206-partial-content) response.
  - If the origin response does not include the `Content-Length` header, the cache will return the full content with an HTTP 200 response.
 
 ## Default cached file extensions