fix docs - Syntax error in graph

docs/en/design.md

@@ -8,6 +8,6 @@
 graph TD
 A(request in) --> B(s)
 B(subjectCreate creates different key - subjects based on the request header content,every key can be tried once) --> C(s)
-C(Different key authentication methods(differnet lock - processors) to process incoming key - subjects) --> D(s)
+C(Different key authentication methods<differnet lock - processors> to process incoming key - subjects) --> D(s)
 D(Once successful is successful and ends, failure means the next key lock attempt until the end of all attempts)
-```
+```
\ No newline at end of file