Remove misleading list of default locations (#10614)

The list of location in the second paragraph was missing pyproject.toml and the user config files.

This change refers to the complete list in the previous paragraph instead of listing all locations again.

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

docs/source/config_file.rst

@@ -13,9 +13,7 @@ to read a different file instead (see :ref:`config-file-flag`).
 It is important to understand that there is no merging of configuration
 files, as it would lead to ambiguity.  The :option:`--config-file <mypy --config-file>` flag
 has the highest precedence and must be correct; otherwise mypy will report
-an error and exit.  Without command line option, mypy will look for defaults,
-but will use only one of them.  The first one to read is ``mypy.ini``,
-then ``.mypy.ini``, and finally ``setup.cfg``.
+an error and exit.  Without command line option, mypy will look for configuration files in the above mentioned order.
 
 Most flags correspond closely to :ref:`command-line flags
 <command-line>` but there are some differences in flag names and some