doc fixes for workflows

Note that sphinx is still complaining about duplicate object descriptions
in workflows.base.WorkflowBase, namely any of the attributes.

docs/workflows.rst

@@ -15,8 +15,8 @@ for doing automatic absolute binding free energy (ABFE) analysis.
 .. currentmodule:: alchemlyb.workflows
 
 .. autosummary::
-    :toctree: workflows
+   :toctree: workflows
 
-    base
-    ABFE
+   base
+   ABFE
 

docs/workflows/alchemlyb.workflows.base.rst

@@ -1,9 +1,10 @@
 The base workflow
 =================
+.. automodule:: alchemlyb.workflows.base
 
-The :class:`alchemlyb.workflows.base.WorkflowBase` provides a basic API
-template for the workflow development.
-The workflow should be able to run in an automatic fashion. ::
+The :class:`alchemlyb.workflows.base.WorkflowBase` class provides a
+basic API template for the workflow development.  The workflow should
+be able to run in an automatic fashion. ::
 
     >>> from alchemlyb.workflows.base import WorkflowBase
     >>> workflow = WorkflowBase(units='kT', software='Gromacs', T=298,
@@ -25,6 +26,8 @@ step-by-step fashion. ::
 
 API Reference
 -------------
+.. currentmodule:: alchemlyb.workflows.base
+
 .. autoclass:: alchemlyb.workflows.base.WorkflowBase
     :members:
     :inherited-members:

src/alchemlyb/workflows/base.py

@@ -1,3 +1,5 @@
+"""Basic building blocks for free energy workflows."""
+
 import pandas as pd
 
 class WorkflowBase():
@@ -13,7 +15,6 @@ class WorkflowBase():
 
     Parameters
     ----------
-
     units : string, optional
         The unit used for printing and plotting results. {'kcal/mol', 'kJ/mol',
         'kT'}. Default: 'kT'.
@@ -30,10 +31,11 @@ class WorkflowBase():
 
     Attributes
     ----------
-
     file_list : list
         A list of files to be read by the parser.
 
+
+    .. versionadded:: 0.7.0
     """
     def __init__(self, units='kT', software='Gromacs', T=298, out='./', *args,
                  **kwargs):