docs: All samples should include all necessary code

samples/api-reference-doc-snippets/family.js

@@ -15,8 +15,7 @@
 const snippets = {
   createColmFamily: async (instanceId, tableId, familyId) => {
     // [START bigtable_api_create_family]
-    const {BigtableTableAdminClient, GCRuleMaker} =
-      require('@google-cloud/bigtable').v2;
+    const {BigtableTableAdminClient} = require('@google-cloud/bigtable').v2;
     const adminClient = new BigtableTableAdminClient();
     const projectId = await adminClient.getProjectId();