Fixed typos and redudant with CPU:0

tutorials/image/cifar10/cifar10_multi_gpu_train.py

@@ -162,10 +162,7 @@ def train():
     opt = tf.train.GradientDescentOptimizer(lr)
 
     # Get images and labels for CIFAR-10.
-    # Force input pipeline to CPU:0 to avoid opertaios sometimes ending up on GPU
-    # and resulting in a slow down.
-    with tf.device('/CPU:0'):
-      images, labels = cifar10.distorted_inputs()
+    images, labels = cifar10.distorted_inputs()
 
     # Calculate the gradients for each model tower.
     tower_grads = []

tutorials/image/cifar10/cifar10_train.py

@@ -62,8 +62,8 @@ def train():
     global_step = tf.contrib.framework.get_or_create_global_step()
 
     # Get images and labels for CIFAR-10.
-    # Force input pipeline to CPU:0 to avoid opertaios sometimes ending up
-    # on GPU and resulting in a slow down.
+    # Force input pipeline to CPU:0 to avoid operations sometimes ending up on
+    # GPU and resulting in a slow down.
     with tf.device('/CPU:0'):
       images, labels = cifar10.distorted_inputs()