fix typo (#1434)

fix typo

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>

docs/ibc/apps.md

@@ -17,7 +17,7 @@ protocol. Then the document goes into detail on the abstraction layer most relev
 developers (channels and ports), and describes how to define your own custom packets, and
 `IBCModule` callbacks.
 
-To have your module interact over IBC you must: bind to a port(s), define your own packet data and acknolwedgement structs as well as how to encode/decode them, and implement the
+To have your module interact over IBC you must: bind to a port(s), define your own packet data and acknowledgement structs as well as how to encode/decode them, and implement the
 `IBCModule` interface. Below is a more detailed explanation of how to write an IBC application
 module correctly.