Fix stagpy.config API ref doc

Author: amorison

docs/sources/apiref/config.rst

@@ -5,7 +5,7 @@ config
    :members:
 
    .. data:: HOME_DIR
-      :annotation: = pathlib.Path(os.path.expanduser('~'))
+      :annotation: = pathlib.Path.home()
 
       Home directory.
 

stagpy/config.py

@@ -1,7 +1,7 @@
-"""Handle configuration of StagPy
+"""Define configuration variables for StagPy.
 
-Create the cmd line argument parser
-and deal with the config file
+See :mod:`stagpy.args` for additional definitions related to the command line
+interface.
 """
 
 from collections import OrderedDict