Move doc of sys.dont_write_bytecode to make all attributes sorted again

Doc/library/sys.rst

@@ -121,6 +121,15 @@ always available.
       Use ``'backslashreplace'`` error handler on :exc:`UnicodeEncodeError`.
 
 
+.. data:: dont_write_bytecode
+
+   If this is true, Python won't try to write ``.pyc`` or ``.pyo`` files on the
+   import of source modules.  This value is initially set to ``True`` or
+   ``False`` depending on the :option:`-B` command line option and the
+   :envvar:`PYTHONDONTWRITEBYTECODE` environment variable, but you can set it
+   yourself to control bytecode file generation.
+
+
 .. function:: excepthook(type, value, traceback)
 
    This function prints out a given traceback and exception to ``sys.stderr``.
@@ -764,15 +773,6 @@ always available.
    implement a dynamic prompt.
 
 
-.. data:: dont_write_bytecode
-
-   If this is true, Python won't try to write ``.pyc`` or ``.pyo`` files on the
-   import of source modules.  This value is initially set to ``True`` or ``False``
-   depending on the ``-B`` command line option and the ``PYTHONDONTWRITEBYTECODE``
-   environment variable, but you can set it yourself to control bytecode file
-   generation.
-
-
 .. function:: setcheckinterval(interval)
 
    Set the interpreter's "check interval".  This integer value determines how often