fix larray-project#301 : updated api.rst to display also instance att…

…ributes (not possible with Sphinx)

doc/source/api.rst

@@ -13,11 +13,23 @@ Axis
 
    Axis
 
+Exploring
+---------
+
+=========================== ==============================================================
+Axis.name                   Name of the axis. None in the case of an anonymous axis
+--------------------------- --------------------------------------------------------------
+:attr:`Axis.labels`         List of labels
+--------------------------- --------------------------------------------------------------
+:attr:`Axis.labels_summary` Short representation of the labels.
+=========================== ==============================================================
+
+Copying
+-------
+
 .. autosummary::
    :toctree: _generated/
 
-   Axis.labels
-   Axis.labels_summary
    Axis.copy
 
 Searching
@@ -227,6 +239,14 @@ Copying
 Inspecting
 ----------
 
+=================== ==============================================================
+LArray.data         Data of the array (Numpy ndarray)
+------------------- --------------------------------------------------------------
+LArray.axes         Axes of the array (AxisCollection)
+------------------- --------------------------------------------------------------
+LArray.title        Title of the array (str)
+=================== ==============================================================
+
 .. autosummary::
    :toctree: _generated/