Fix comment typo.

Co-authored-by: Michael Sandstedt <michael.sandstedt@gmail.com>

src/app/tests/TestWriteInteraction.cpp

@@ -304,7 +304,7 @@ void TestWriteInteraction::TestWriteHandler(nlTestSuite * apSuite, void * apCont
             {
                 //
                 // In a normal execution flow, the exchange manager would have closed out the exchange after the
-                // message dispatch call path had unwinded. In this test however, we've manually allocated the exchange
+                // message dispatch call path had unwound. In this test however, we've manually allocated the exchange
                 // ourselves (as opposed to the exchange manager), so we need to take ownership of closing out the exchange.
                 //
                 // Note that this doesn't happen in the success case above, since that results in a call to send a message through