[SPARK-11671] documentation code example typo
[SPARK-11671] documentation code example typo

Example for sqlContext.createDataDrame from pandas.DataFrame has a typo

Author: Chris Snow <chsnow123@gmail.com>

Closes #9639 from snowch/patch-2.

haowu80s/spark,haowu80s/spark,haowu80s/spark,haowu80s/spark,haowu80s/spark,haowu80s/spark