Another update.

README.md

@@ -210,8 +210,8 @@ This time we get the error:
 < {"error":"unexpected end of program, i.e. no HALT"}
 ```
 
-We cannot execute beyond a HALT instruction! In general, errors are return in
-the form:
+We cannot execute beyond a HALT instruction! In general, errors are returned
+in the form:
 
 ```
 < { "error": string }