[SSL] Add note on intermediate selection for bundling

Clarify selection of intermediates for certificate bundling methods.
CUSTESC-56462

Author: ngayerie

src/content/docs/ssl/edge-certificates/custom-certificates/bundling-methodologies.mdx

@@ -16,6 +16,8 @@ Cloudflare maintains intermediate and root certificates used for bundling on a [
 
 Expiration values for these certificates may appear in the `expires_on` field when you use the [Analyze Certificate endpoint](/api/resources/ssl/subresources/analyze/methods/create/) - often when the methodology you specify is [Compatible](#compatible). However, these expiration values reflect intermediate and root certificates - which are handled by Cloudflare -, not the leaf certificate you would have previously uploaded to Cloudflare.
 
+Please note that a selection might be done on the intermediates provided at upload time when using `Compatible` or `Modern`: it's not guaranteed all of them will make it the final chain. You'll need to use `User-defined` to ensure the chain you've uploaded is the one used.
+
 ## Methodologies
 
 ### Compatible