DOC: improve conformation to PEP8

Author: saurav-chakravorty

doc/source/io.rst

@@ -22,7 +22,6 @@
                          index=['x', 'y', 'z'])
 
 
-
 ===============================
 IO Tools (Text, CSV, HDF5, ...)
 ===============================
@@ -1044,7 +1043,10 @@ DD/MM/YYYY instead. For convenience, a ``dayfirst`` keyword is provided:
 .. ipython:: python
    :suppress:
 
-   data = "date,value,cat\n1/6/2000,5,a\n2/6/2000,10,b\n3/6/2000,15,c"
+   data = ("date,value,cat\n
+           "1/6/2000,5,a\n"
+           "2/6/2000,10,b\n"
+           "3/6/2000,15,c")
    with open('tmp.csv', 'w') as fh:
        fh.write(data)