Update an authentication comment

Kerollmops · ManyTheFish · web-flow · commit 47748395dcfc · 2023-02-13T17:20:08.000+01:00
Co-authored-by: Many the fish &lt;many@meilisearch.com&gt;
diff --git a/meilisearch/src/extractors/authentication/mod.rs b/meilisearch/src/extractors/authentication/mod.rs
@@ -199,7 +199,7 @@ pub mod policies {
             token: &str,
             index: Option<&str>,
         ) -> Option<AuthFilter> {
-            // Tenant token will always define an index.
+            // A tenant token only has access to the search route which always defines an index.
             let index = index?;
 
             // Only search action can be accessed by a tenant token.
