Fix DataPipe tutorial linting (#1071)

Summary:
Pull Request resolved: #1071

Fixes linting (stye) error introduced by #946

Test Plan: Imported from OSS

Reviewed By: ejguan

Differential Revision: D43883135

Pulled By: NivekT

fbshipit-source-id: b48709c280f4999b07ca84af7e9fafea329fa6a5

Author: NivekT

docs/source/dp_tutorial.rst

@@ -542,4 +542,3 @@ Here is an example of loading a CSV file - the famous Titanic dataset (`download
     # [{'label': array(0, dtype=int32), 'data': array([ 3., 22.], dtype=float32)},
     #  {'label': array(1, dtype=int32), 'data': array([ 1., 38.], dtype=float32)},
     #  {'label': array(1, dtype=int32), 'data': array([ 3., 26.], dtype=float32)}]
-