Pydoc: Fix sphinx compile warnings about freestyle

Sphinx expects functions and methods with the same name and different
parameters to be written using one directive. See:
https://www.sphinx-doc.org/en/master/usage/restructuredtext/domains.html#basic-markup

Unfortunately this makes giving different descriptions for each harder.
This was already a request for better support for this in sphinx, see:
https://github.com/sphinx-doc/sphinx/issues/7787

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D9170

source/blender/freestyle/intern/python/UnaryFunction1D/BPy_UnaryFunction1DVectorViewShape.cpp

@@ -80,13 +80,10 @@ static char UnaryFunction1DVectorViewShape___doc__[] =
     "objects.\n"
     "\n"
     ".. method:: __init__()\n"
+    "            __init__(integration_type)\n"
     "\n"
-    "   Default constructor.\n"
-    "\n"
-    ".. method:: __init__(integration_type)\n"
-    "\n"
-    "   Builds a unary 1D function using the integration method given as\n"
-    "   argument.\n"
+    "   Builds a unary 1D function using the default constructor\n"
+    "   or the integration method given as an argument.\n"
     "\n"
     "   :arg integration_type: An integration method.\n"
     "   :type integration_type: :class:`IntegrationType`\n";