Update csv.rst mistake with literal syntax

Author: aterrel

Doc/library/csv.rst

@@ -333,7 +333,7 @@ The :mod:`csv` module defines the following constants:
 
    Instructs :class:`reader` objects to convert all non-quoted fields to type *float*.
 
-   ```True``` and ```False``` are numeric types in Python so using this option will
+   ``True`` and ``False`` are numeric types in Python so using this option will
    not quote them.