[centrality] added metrics-family to docs

doc/metrics/CMakeLists.txt

@@ -1,7 +1,8 @@
 
 SET(LOCAL_FILES
-    pgr_betweennessCentrality.rst
-    )
+    metrics-family.rst
+		pgr_betweennessCentrality.rst 
+   )
 
 foreach (f ${LOCAL_FILES})
     configure_file(${f} "${PGR_DOCUMENTATION_SOURCE_DIR}/${f}")

doc/metrics/metrics-family.rst

@@ -0,0 +1,41 @@
+..
+   ****************************************************************************
+    pgRouting Manual
+    Copyright(c) pgRouting Contributors
+
+    This documentation is licensed under a Creative Commons Attribution-Share
+    Alike 3.0 License: https://creativecommons.org/licenses/by-sa/3.0/
+   ****************************************************************************
+
+|
+
+
+
+Metrics - Family of functions
+===============================================================================
+
+.. rubric:: Experimental
+
+.. include:: experimental.rst
+   :start-after: begin-warn-expr
+   :end-before: end-warn-expr
+
+.. index experimental from here
+
+* :doc:`pgr_betweennessCentrality` - Calculates relative betweenness centrality using Brandes Algorithm
+
+.. index experimental to here
+
+
+.. toctree::
+    :hidden:
+
+    pgr_betweennessCentrality
+
+See Also
+-------------------------------------------------------------------------------
+
+.. rubric:: Indices and tables
+
+* :ref:`genindex`
+* :ref:`search`

doc/src/experimental.rst

@@ -83,6 +83,12 @@ Experimental Functions
    :start-after: index from here
    :end-before: index to here
 
+:doc:`metrics-family`
+
+.. include:: metrics-family.rst
+   :start-after: index experimental from here
+   :end-before: index experimental to here
+
 :doc:`TRSP-family`
 
 .. include:: TRSP-family.rst