Update pagination.md

Fixed 2 missing spaces in Custom Pagination snippet

Author: pauloxnet

docs/api-guide/pagination.md

@@ -226,8 +226,8 @@ Suppose we want to replace the default pagination output style with a modified f
         def get_paginated_response(self, data):
             return Response({
                 'links': {
-                   'next': self.get_next_link(),
-                   'previous': self.get_previous_link()
+                    'next': self.get_next_link(),
+                    'previous': self.get_previous_link()
                 },
                 'count': self.page.paginator.count,
                 'results': data