Move terminology definition to class related

As of now, the glossary defined in our documentation reflects the
current state of the codebase. In order to avoid any discrepancy
between the codebase and each definition, the objective here is to
gather both in a single place and link it into the rst documentation
via a custom directive.
Also re-aligned the requirements with liberty for doc.

Change-Id: I3089fd9f948b948115672f10937b1500b96ce180
Partial-Bug: #1526671

watcher/decision_engine/manager.py

@@ -17,6 +17,26 @@
 # limitations under the License.
 #
 
+"""
+This component is responsible for computing a set of potential optimization
+:ref:`Actions <action_definition>` in order to fulfill the
+:ref:`Goal <goal_definition>` of an :ref:`Audit <audit_definition>`.
+
+It first reads the parameters of the :ref:`Audit <audit_definition>` from the
+associated :ref:`Audit Template <audit_template_definition>` and knows the
+:ref:`Goal <goal_definition>` to achieve.
+
+It then selects the most appropriate :ref:`Strategy <strategy_definition>`
+depending on how Watcher was configured for this :ref:`Goal <goal_definition>`.
+
+The :ref:`Strategy <strategy_definition>` is then executed and generates a set
+of :ref:`Actions <action_definition>` which are scheduled in time by the
+:ref:`Watcher Planner <watcher_planner_definition>` (i.e., it generates an
+:ref:`Action Plan <action_plan_definition>`).
+
+See :doc:`architecture` for more details on this component.
+"""
+
 from oslo_config import cfg
 from oslo_log import log