clarify difference between searches and search requests

Author: guimachiavelli

learn/analytics/analytics_metrics_reference.mdx

@@ -5,7 +5,7 @@ description: This reference describes the metrics you can find in the Meilisearc
 
 ## Total searches
 
-Total number of searches made in the selected indexes during the specified period.
+Total number of searches made in the selected indexes during the specified period. Multi-search and federated search requests count as a single search.
 
 ## Total users