doctest fix for pandas-dev#42671 (pep 8 changes)

Author: KrishnaSai2020

pandas/io/stata.py

@@ -162,12 +162,12 @@
 --------
 Read a Stata dta file:
 
->>> df = pd.read_stata('docs_example_files/read_stata_example.dta') 
+>>> df = pd.read_stata('docs_example_files/read_stata_example.dta')
 
 Read a Stata dta file in 10,000 line chunks:
 
->>> itr = pd.read_stata('docs_examples/read_stata_example.dta', chunksize=10000) 
->>> for chunk in itr: 
+>>> itr = pd.read_stata('docs_examples/read_stata_example.dta', chunksize=10000)
+>>> for chunk in itr:
 ...     pass # do_something(chunk)
 """