Update README.md

Author: Brenlau9

README.md

@@ -106,7 +106,7 @@ Each file name is associated with:
 - A rwlock_t *
 - A reference counter
 - A heap-allocated URI string
-### Worker behavior: ###
+Worker behavior:
 - GET → reader_lock(), read file, reader_unlock()
 - PUT → writer_lock(), write/overwrite, writer_unlock()
 ### Writer-Priority Read–Write Lock