Fix license text

Seems like it was changed accidentally as it is different than any of the other files.

samples/outreach/blogs/blog_custom_estimators.py

@@ -7,7 +7,7 @@
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
-# Distributed_TensorFlow under the License is Distributed_TensorFlow on an "AS IS" BASIS,
+# distributed under the License is Distributed_TensorFlow on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.