Update docs/concepts/search/searchable-properties/session-replay.mdx

Co-authored-by: Alex Krawiec <[email protected]>

Author: aliu39

docs/concepts/search/searchable-properties/session-replay.mdx

@@ -283,7 +283,7 @@ Full name of the city of the user's geolocation.
 
 ### `user.geo.country_code`
 
-Country of the user's geolocation. Country code is based on ISO 3166-1.
+Country of the user's geolocation. Country code is based on [ISO 3166-1](https://www.iso.org/iso-3166-country-codes.html).
 
 - **Type:** string