[SSL] Add note about CAA records completeness (#26147)

* [SSL] Add note about CAA records completeness

Added a note regarding the completeness of the CAA records list.
PCX-19177

* Small style edit

---------

Co-authored-by: Denise Peña <[email protected]>

Author: ngayerie

src/content/partials/ssl/caa-records-added-by-cf.mdx

@@ -31,3 +31,7 @@ If Cloudflare has automatically added CAA records on your behalf, these records
 0 issue "sectigo.com"
 0 issuewild "sectigo.com"
 ```
+
+:::note
+This list is not exhaustive, and other CAs might be added or removed for operational reasons.
+:::