Fix typos in API docs and Python docstring for ExponentialMovingAvera…

…ge object. (tensorflow#2369)

* Fix two typos in API docs for ExponentialMovingAverage object.

* Fix two typos in Python docstring for ExponentialMovingAverage object.

tensorflow/g3doc/api_docs/python/train.md

@@ -948,7 +948,7 @@ saver.restore(...checkpoint filename...)
 
 Creates a new ExponentialMovingAverage object.
 
-The `Apply()` method has to be called to create shadow variables and add
+The `apply()` method has to be called to create shadow variables and add
 ops to maintain moving averages.
 
 The optional `num_updates` parameter allows one to tweak the decay rate
@@ -965,7 +965,7 @@ move faster.  If passed, the actual decay rate used is:
 *  <b>`decay`</b>: Float.  The decay to use.
 *  <b>`num_updates`</b>: Optional count of number of updates applied to variables.
 *  <b>`name`</b>: String. Optional prefix name to use for the name of ops added in
-    `Apply()`.
+    `apply()`.
 
 
 - - -

tensorflow/python/training/moving_averages.py

@@ -210,7 +210,7 @@ class ExponentialMovingAverage(object):
   def __init__(self, decay, num_updates=None, name="ExponentialMovingAverage"):
     """Creates a new ExponentialMovingAverage object.
 
-    The `Apply()` method has to be called to create shadow variables and add
+    The `apply()` method has to be called to create shadow variables and add
     ops to maintain moving averages.
 
     The optional `num_updates` parameter allows one to tweak the decay rate
@@ -225,7 +225,7 @@ def __init__(self, decay, num_updates=None, name="ExponentialMovingAverage"):
       decay: Float.  The decay to use.
       num_updates: Optional count of number of updates applied to variables.
       name: String. Optional prefix name to use for the name of ops added in
-        `Apply()`.
+        `apply()`.
     """
     self._decay = decay
     self._num_updates = num_updates