Fixes for Datastore gcloud-node snippets.

- Correct typo in snippet region.
- Installation instructions should not be in build_service snippet.
- Batch ops included too much extra info.

Author: pcostell

datastore/concepts.js

@@ -262,7 +262,7 @@ Entity.prototype.testLookup = function(callback) {
       // };
     }
   });
-  // [End lookup]
+  // [END lookup]
 
   this.datastore.insert({
     key: taskKey,
@@ -337,7 +337,6 @@ Entity.prototype.testDelete = function(callback) {
 Entity.prototype.testBatchUpsert = function(callback) {
     datastore.key = this.datastore.key;
 
-  // [START batch_upsert]
   var taskKey1 = datastore.key(['Task', 1]);
   var taskKey2 = datastore.key(['Task', 2]);
 
@@ -355,6 +354,7 @@ Entity.prototype.testBatchUpsert = function(callback) {
     description: 'Integrate Cloud Datastore'
   };
 
+  // [START batch_upsert]
   datastore.upsert([
     {
       key: taskKey1,
@@ -392,19 +392,9 @@ Entity.prototype.testBatchLookup = function(callback) {
   datastore.get([
     taskKey1,
     taskKey2
-  ], function(err, entities) {
+  ], function(err, tasks) {
     if (!err) {
-      // entities[0].data = {
-      //   type: 'Personal',
-      //   done: false,
-      //   priority: 4,
-      //   description: 'Learn Cloud Datastore'
-      // };
-
-      // entities[1].data = {
-      //   type: 'Work',
-      //   // ...
-      // };
+      // Tasks retrieved successfully.
     }
   });
   // [END batch_lookup]
@@ -651,12 +641,12 @@ Query.prototype.getProjectionQuery = function() {
 Query.prototype.getAncestorQuery = function() {
   var datastore = this.datastore;
 
-  // [START anscestor_query]
+  // [START ancestor_query]
   var ancestorKey = datastore.key(['TaskList', 'default']);
 
   var query = datastore.createQuery('Task')
     .hasAncestor(ancestorKey);
-  // [END anscestor_query]
+  // [END ancestor_query]
 
   return query;
 };
@@ -852,11 +842,11 @@ Query.prototype.testArrayValueInequalityRange = function(callback) {
 Query.prototype.testArrayValueEquality = function(callback) {
   var datastore = this.datastore;
 
-  // [START array_value_equality_range]
+  // [START array_value_equality]
   var query = datastore.createQuery('Task')
     .filter('tag =', 'fun')
     .filter('tag =', 'programming');
-  // [END array_value_equality_range]
+  // [END array_value_equality]
 
   this.datastore.runQuery(query, callback);
 };

datastore/tasks.js

@@ -13,7 +13,6 @@
 
 'use strict';
 
-var gcloud = require('gcloud');
 var input = process.argv.splice(2);
 var command = input.shift();
 
@@ -22,12 +21,16 @@ if (!projectId) {
   throw new Error('TEST_PROJECT_ID environment variable required.');
 }
 
+// [START build_service]
+var gcloud = require('gcloud');
+
 var datastore = gcloud.datastore({
   projectId: projectId
 });
+// [END build_service]
 
 /*
-// [START build_service]
+Installation and setup instructions.
 1. Download the TaskList sample application from [here]
 (https://github.com/GoogleCloudPlatform/nodejs-docs-samples/archive/master.zip).
 
@@ -61,7 +64,6 @@ export DATASTORE_PROJECT_ID=<project-id>
 ```sh
 npm run tasks
 ```
-// [END build_service]
 */
 
 // [START add_entity]
@@ -130,7 +132,7 @@ function listTasks(callback) {
 }
 // [END retrieve_entities]
 
-// [START delete_task]
+// [START delete_entity]
 function deleteTask(taskId, callback) {
   var taskKey = datastore.key([
     'Task',
@@ -139,7 +141,7 @@ function deleteTask(taskId, callback) {
 
   datastore.delete(taskKey, callback);
 }
-// [END delete_task]
+// [END delete_entity]
 
 // [START format_results]
 function formatTasks(tasks) {