Add example of a user context

Author: gmourier

learn/personalization/search_personalization.mdx

@@ -20,7 +20,7 @@ You send Meilisearch the user’s query along with a short description of their
 
 In other words:
 
-- You generate a compact, plain-text description of the user at search time.
+- You generate a compact, plain-text description of the user at search time. e.g "The user prefers genres like Documentary, Music, Drama. User engaged with content related to Rap or Hip-Hop."
 - Meilisearch combines it with the query and retrieved documents for that query.
 - The model then reorders results based on the user context so they feel more relevant to that user.