Update README.md

Author: brendaweles

pivot_tables/README.md

@@ -1,5 +1,5 @@
-These downloads contain three files for use with the RealPython tutorial [How To Create A Pivot Table With Pandas](https://realpython.com/how-to-pandas-pivot-table/).
+These downloads contain three files to use with the RealPython tutorial [How to Create a Pivot Table With Pandas](https://realpython.com/how-to-pandas-pivot-table/).
 
 code_downloads.ipynb contains the main code from the tutorial.
 solutions.ipynb contains sample solutions to the various exercises.
-sales_data.csv contains the source data used throughout the tutorial.
+sales_data.csv contains the source data used throughout the tutorial.