fixup! DOC: What's New for refactored compression code

Author: dhimmel

doc/source/whatsnew/v0.20.0.txt

@@ -54,7 +54,7 @@ now both inferred using their file extensions.
    url = ('https://github.com/pandas-dev/pandas/raw/master/' +
           'pandas/io/tests/parser/data/salaries.csv.bz2')
    pd.read_table(url, compression='infer')  # default, infer compression
-   pd.read_table(url, compression='xz')  # explicitly specify compression
+   pd.read_table(url, compression='bz2')  # explicitly specify compression
 
 .. _whatsnew_0200.enhancements.other: