chore: fix typo in plugins/overview (#578)

docs/plugins/overview.mdx

@@ -91,7 +91,7 @@ const addLastModified = (incomingConfig: Config): Config => {
   // Find all incoming auth-enabled collections
   // so we can create a lastModifiedBy relationship field
   // to all auth collections
-  const authEnabledCollections = incomingConfig.collections.find(
+  const authEnabledCollections = incomingConfig.collections.filter(
     collection => Boolean(collection.auth)
   );
 
@@ -125,8 +125,8 @@ const addLastModified = (incomingConfig: Config): Config => {
             },
           },
         ],
-      },
-    });
+      };
+    }),
   };
 
   return config;