Fix typo in CpdReport.java

Co-authored-by: Piotrek Żygieło <pzygielo@users.noreply.github.com>
diff --git a/src/main/java/org/apache/maven/plugins/pmd/CpdReport.java b/src/main/java/org/apache/maven/plugins/pmd/CpdReport.java
index 6163094..6bd73b2 100644
--- a/src/main/java/org/apache/maven/plugins/pmd/CpdReport.java
+++ b/src/main/java/org/apache/maven/plugins/pmd/CpdReport.java
@@ -313,7 +313,7 @@
         // so the "check" goals can check for violations
         writeXmlReport( cpd );
 
-        // html format is handled by maven site report, xml format has already bean rendered
+        // html format is handled by maven site report, xml format has already been rendered
         if ( !isHtml() && !isXml() )
         {
             writeFormattedReport( cpd );