Fix a missing trim;

graphql/introspection.lua

@@ -346,7 +346,7 @@ __InputValue = types.object({
 __EnumValue = types.object({
   name = '__EnumValue',
 
-  description = [[
+  description = util.trim [[
     One possible value for a given Enum. Enum values are unique values, not
     a placeholder for a string or numeric value. However an Enum value is
     returned in a JSON response as a string.