Add documentation for all path parameters

endpoints/api/search.py

@@ -1,5 +1,5 @@
 from endpoints.api import (ApiResource, parse_args, query_param, truthy_bool, nickname, resource,
-                           require_scope)
+                           require_scope, path_param)
 from data import model
 from auth.permissions import (OrganizationMemberPermission, ViewTeamPermission,
                               ReadRepositoryPermission, UserAdminPermission,
@@ -12,6 +12,7 @@ from util.gravatar import compute_hash
 @resource('/v1/entities/<prefix>')
 class EntitySearch(ApiResource):
   """ Resource for searching entities. """
+  @path_param('prefix', 'The prefix of the entities being looked up')
   @parse_args
   @query_param('namespace', 'Namespace to use when querying for org entities.', type=str,
                default='')