[FIX] doc: fix some sphinx warnings

* crashing patch for howto "Build a module"
* javascript_reference: "Bullet list ends without a blank line; unexpected unindent."

doc/howtos/backend/exercise-translations

@@ -48,7 +48,7 @@ diff --git a/openacademy/models.py b/openacademy/models.py
                  },
              }
  
-@@ -132,4 +132,4 @@ class Session(models.Model):
+@@ -114,4 +114,4 @@ class Session(models.Model):
      def _check_instructor_not_in_attendees(self):
          for r in self:
              if r.instructor_id and r.instructor_id in r.attendee_ids:

doc/reference/javascript_reference.rst

@@ -1768,8 +1768,8 @@ order.
     Options:
 
     - website_path: (default:false) by default, the widget forces (if not already
-    the case) the href value to begin with http:// except if this option is set
-    to true, thus allowing redirections to the database's own website.
+      the case) the href value to begin with http:// except if this option is set
+      to true, thus allowing redirections to the database's own website.
 
     - Supported field types: *char*