pythonGH-135243: change use to understand

Author: weflower

Doc/library/csv.rst

@@ -30,9 +30,9 @@ read and write files without having to account for inconsistencies.
 The :mod:`csv` module implements classes to read and write tabular data in CSV
 format.  For example, the module enables programmers to say, "write this data in the
 format preferred by Excel," or "read data from this file which was generated by Excel,"
-without knowing the precise details of the CSV format that is used by Excel.  Programmers
-can also describe CSV formats that are used by other applications or define custom CSV
-formats for specific use cases.
+without knowing the precise details of the CSV format that is understood by Excel.
+Programmers can also describe CSV formats that are understood by other applications or
+define custom dialects (CSV formats) for specific use cases.
 
 The :mod:`csv` module's :class:`reader` and :class:`writer` objects read and
 write sequences.  Programmers can also read and write data in dictionary form