Improved readability of bugfix description; minor style fixes of the test

Author: ivannz

doc/source/whatsnew/v0.19.0.txt

@@ -673,7 +673,7 @@ Performance Improvements
 Bug Fixes
 ~~~~~~~~~
 
-- Bug in ``pandas.parser.parser_trim_buffers()``, which did not update the word vectors (``parser->words``) when stream buffer was shrunk (:issue:`13788`, :issue:`13703`)
+- Bug in ``pd.read_csv()`` causing a segfault when iterating over a large file in chunks (:issue:`13703`)
 - Bug in ``io.json.json_normalize()``, where non-ascii keys raised an exception (:issue:`13213`)
 - Bug in ``SparseSeries`` with ``MultiIndex`` ``[]`` indexing may raise ``IndexError`` (:issue:`13144`)
 - Bug in ``SparseSeries`` with ``MultiIndex`` ``[]`` indexing result may have normal ``Index`` (:issue:`13144`)

pandas/io/tests/parser/common.py

@@ -1542,7 +1542,7 @@ def test_parse_trim_buffers(self):
             """99,,ZZZ,,,,,,,ZZZ,ZZZ,,,,,"""
         csv_data = "\n".join([record_] * n_lines) + "\n"
 
-        output_ = list()
+        output_ = []
         for chunksize_ in chunksizes:
             try:
                 iterator_ = self.read_csv(StringIO(csv_data), header=None,