docstrings: fix "Sphinx param with type" pattern (#807)

* docstrings: fix "Sphinx param with type" pattern

Previously, the pattern only matched if the parameter description
followed on the same line, like so:

    :param type foo: A param named foo.

However, it's also valid for the parameter description to be wrapped
onto the next line, like so:

    :param type foo:
        A param named foo.

This change updates the pattern to match the second example as well, and
adds a test to verify this behaviour.

Fixes #806.

* Add Simon Ruggier to the AUTHORS file

test/completion/docstring.py

@@ -49,6 +49,17 @@ def sphinxy2(a, b, x):
 #? 
 sphinxy2()
 
+
+def sphinxy_param_type_wrapped(a):
+    """
+    :param str a:
+        Some description wrapped onto the next line with no space after the
+        colon.
+    """
+    #? str()
+    a
+
+
 # local classes -> github #370
 class ProgramNode():
     pass