docs: grammar

@khmarbaise
diff --git a/src/main/java/org/apache/maven/plugins/jar/TestJarMojo.java b/src/main/java/org/apache/maven/plugins/jar/TestJarMojo.java
index 5c90449..10a7c38 100644
--- a/src/main/java/org/apache/maven/plugins/jar/TestJarMojo.java
+++ b/src/main/java/org/apache/maven/plugins/jar/TestJarMojo.java
@@ -53,7 +53,7 @@
     private File testClassesDirectory;
 
     /**
-     * Classifier to used for {@code test-jar}.
+     * Classifier to use for {@code test-jar}.
      */
     @Parameter( defaultValue = "tests" )
     private String classifier;