INT-4551: Fix exception msg from previous commit

JIRA: https://jira.spring.io/browse/INT-4551

**Cherry-pick to 5.0.x**

spring-integration-core/src/main/java/org/springframework/integration/config/IntegrationRegistrar.java

@@ -49,7 +49,7 @@ public class IntegrationRegistrar implements ImportBeanDefinitionRegistrar {
 			throw new ApplicationContextException("Starting with Spring Integration 5.0, "
 					+  "the 'spring-integration-java-dsl' dependency is no longer needed; "
 					+ "the Java DSL has been merged into the core project. "
-					+ "Having it present it on the classpath causes class loading conflicts.");
+					+ "If it is present on the classpath, it will cause class loading conflicts.");
 		}
 	}