Cleans up docstring formatting by replacing @return/@param with :retu…

…rn/:param

hamilton/dev_utils/deprecation.py

@@ -159,8 +159,8 @@ def __call__(self, fn: Callable):
         TODO -- use @singledispatchmethod when we no longer support 3.6/3.7
         https://docs.python.org/3/library/functools.html#functools.singledispatchmethod
 
-        @param fn: function (or class) to decorate
-        @return: The decorated function.
+        :param fn: function (or class) to decorate
+        :return: The decorated function.
         """
         # In this case we just do a standard decorator
         if isinstance(fn, types.FunctionType):

hamilton/function_modifiers.py

@@ -72,8 +72,8 @@ def value(literal_value: Any) -> LiteralDependency:
     """Specifies that a parameterized dependency comes from a "literal" source.
     E.G. value("foo") means that the value is actually the string value "foo"
 
-    @param literal_value: Python literal value to use
-    @return: A LiteralDependency object -- a signifier to the internal framework of the dependency type
+    :param literal_value: Python literal value to use
+    :return: A LiteralDependency object -- a signifier to the internal framework of the dependency type
     """
     if isinstance(literal_value, LiteralDependency):
         return literal_value
@@ -85,8 +85,8 @@ def source(dependency_on: Any) -> UpstreamDependency:
     This means that it comes from a node somewhere else.
     E.G. source("foo") means that it should be assigned the value that "foo" outputs.
 
-    @param dependency_on: Upstream node to come from
-    @return:An UpstreamDependency object -- a signifier to the internal framework of the dependency type.
+    :param dependency_on: Upstream node to come from
+    :return:An UpstreamDependency object -- a signifier to the internal framework of the dependency type.
     """
     if isinstance(dependency_on, UpstreamDependency):
         return dependency_on