Replace usages of Tensorflow DistributionStrategy method experimental_run_v2 with run.

PiperOrigin-RevId: 318852933
Change-Id: I10e255518dbed9bff095dc08d46d6cb8dde58830

tensorflow/python/distribute/mirrored_run.py

@@ -83,7 +83,7 @@ def call_for_each_replica(strategy, fn, args=None, kwargs=None):
         "overhead currently. We will be working on improving "
         "this in the future, but for now please wrap "
         "`call_for_each_replica` or `experimental_run` or "
-        "`experimental_run_v2` inside a tf.function to get "
+        "`run` inside a tf.function to get "
         "the best performance." % strategy.__class__.__name__, 5)
   else:
     # When a tf.function is wrapped to trigger _call_for_each_replica (see

tensorflow/python/distribute/ps_values_test.py

@@ -57,7 +57,7 @@ class AggregatingVariableTest(test.TestCase, parameterized.TestCase):
 
     per_replica_results = self.evaluate(
         distribution.experimental_local_results(
-            distribution.experimental_run_v2(assign)))
+            distribution.run(assign)))
     self.assertAllEqual([3], per_replica_results)