Add missing whitespace between words in docs
diff --git a/docs/application_development.md b/docs/application_development.md
index 22fc6d2..6bfa3fd 100644
--- a/docs/application_development.md
+++ b/docs/application_development.md
@@ -2077,7 +2077,7 @@
The platform does not make assumptions about the tuple
type, it could be any Java object. The operator developer knows what
tuple type an input port expects and is capable of processing. Each
-input port has a stream codec associated thatdefines how data is serialized when transmitted over a socket
+input port has a stream codec associated that defines how data is serialized when transmitted over a socket
stream; it also defines another
function that computes the partition hash key for the tuple. The engine
uses that key to determine which physical instance(s) (for a
