Fix rendering issue in secret-handshake (#2238)

Author: kytrinyx

exercises/secret-handshake/instructions.md

@@ -43,5 +43,6 @@ jump, double blink
 
 ~~~~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
 ~~~~