Polish messages

Author: philwebb

spring-javaformat/spring-javaformat-checkstyle/src/main/resources/io/spring/javaformat/checkstyle/check/messages.properties

@@ -9,10 +9,10 @@ javadoc.publicSince=Javadoc @since tag should not be used on private classes.
 header.unexpected=Unexpected header.
 nothis.unexpected=Reference to instance variable ''{0}'' should not use \"this.\".
 methodorder.outOfOrder=Method ''{0}'' is out of order, expected {1}.
-junit5.bannedImport="Import ''{0}'' should not be used in a JUnit 5 test."
-junit5.bannedTestAnnotation="JUnit 4 @Test annotation should not be used in a JUnit 5 test."
-junit5.lifecyclePublicMethod="Lifecycle method ''{0}'' should not be public."
-junit5.lifecyclePrivateMethod="Lifecycle method ''{0}'' should not be private."
-junit5.testPublicMethod="Test method ''{0}'' should not be public."
-junit5.testPrivateMethod="Test method ''{0}'' should not be private."
-methodvisibility.publicMethod="Method ''{0}'' in private class should not be public."
+junit5.bannedImport=Import ''{0}'' should not be used in a JUnit 5 test.
+junit5.bannedTestAnnotation=JUnit 4 @Test annotation should not be used in a JUnit 5 test.
+junit5.lifecyclePublicMethod=Lifecycle method ''{0}'' should not be public.
+junit5.lifecyclePrivateMethod=Lifecycle method ''{0}'' should not be private.
+junit5.testPublicMethod=Test method ''{0}'' should not be public.
+junit5.testPrivateMethod=Test method ''{0}'' should not be private.
+methodvisibility.publicMethod=Method ''{0}'' in private class should not be public.