Fix special block formatting

Author: kytrinyx

exercises/secret-handshake/instructions.md

@@ -41,7 +41,7 @@ The secret handshake for 26 is therefore:
 jump, double blink
 ```
 
-```exercism/note
+~~~~exercism/note
 If you aren't sure what binary is or how it works, check out [this binary tutorial][intro-to-binary].
 [intro-to-binary]: https://medium.com/basecs/bits-bytes-building-with-binary-13cb4289aafa
-```
+~~~~