Activate the napoleon extension for sphinx.

Support parsing of humanly marked-up docstrings.

Author: pavoljuhas

doc/manual/source/conf.py

@@ -31,7 +31,8 @@
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.coverage', 'sphinx.ext.pngmath']
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest',
+        'sphinx.ext.coverage', 'sphinx.ext.pngmath', 'sphinx.ext.napoleon']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']