fix broken array-in snippets

Author: morganchen12

firestore-next/test.firestore.js

@@ -892,7 +892,7 @@ describe("firestore", () => {
               const { query, where } = require("firebase/firestore");  
 
               const q = query(citiesRef, 
-                where('regions', 'array-contains-any', ['west_coast', 'east_coast']));
+                where('regions', 'array-contains-any', [['west_coast'], ['east_coast']]));
               // [END array_contains_any_filter]
             });
 

firestore/test.firestore.js

@@ -877,7 +877,7 @@ describe("firestore", () => {
                 const citiesRef = db.collection('cities');
                 // [START array_contains_any_filter]
                 citiesRef.where('regions', 'array-contains-any',
-                    ['west_coast', 'east_coast']);
+                    [['west_coast'], ['east_coast']]);
                 // [END array_contains_any_filter]
             });