Spec improvements

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/web/views/activity_pub/actor_view.ex

@@ -17,6 +17,7 @@ defmodule Mobilizon.Web.ActivityPub.ActorView do
   @json_ld_header Utils.make_json_ld_header()
   @selected_member_roles ~w(creator administrator moderator member)a
 
+  @spec render(String.t(), map()) :: map()
   def render("actor.json", %{actor: actor}) do
     actor
     |> Convertible.model_to_as()

lib/web/views/activity_pub/object_view.ex

@@ -3,6 +3,7 @@ defmodule Mobilizon.Web.ActivityPub.ObjectView do
 
   alias Mobilizon.Federation.ActivityPub.{Activity, Utils}
 
+  @spec render(String.t(), map()) :: map()
   def render("activity.json", %{activity: %Activity{local: local, data: data} = activity}) do
     %{
       "id" => data["id"],