Reword description per review comments
diff --git a/tensorflow/core/api_def/base_api/api_def_AssertNextDataset.pbtxt b/tensorflow/core/api_def/base_api/api_def_AssertNextDataset.pbtxt
index c1ad34a..00dfbf8 100644
--- a/tensorflow/core/api_def/base_api/api_def_AssertNextDataset.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_AssertNextDataset.pbtxt
@@ -19,12 +19,14 @@
description: <<END
Core C++ implementation of the transformation `assert_next()`, which is
an internal component of `tf.data`'s Python API.
-This transformation checks whether the Pascal-case names (i.e. "FlatMap", not
-"flat_map") of the transformations immediately after it match the list of names
-in the `transformations` argument. The transformation raises an exception if
-it finds any discrepancies.
-The check occurs immediately before iterating over the results of the
-root dataset, which means that the check happens *after* any `tf.data`
-optimizations or static optimizations are applied to the dataflow graph.
+
+This transformation checks whether the camel-case names (i.e. "FlatMap", not
+"flat_map") of the transformations following this transformation match the list
+of names in the `transformations` argument. If there is a mismatch, the
+transformation raises an exception.
+
+The check occurs when iterating over the contents of the dataset, which
+means that the check happens *after* any static optimizations are applied
+to the dataset graph.
END
}
