replace StringBuffer by StringBuilder

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1384337 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/maven/plugin/docck/AbstractCheckDocumentationMojo.java b/src/main/java/org/apache/maven/plugin/docck/AbstractCheckDocumentationMojo.java
index 65b2ccf..b16f7e2 100644
--- a/src/main/java/org/apache/maven/plugin/docck/AbstractCheckDocumentationMojo.java
+++ b/src/main/java/org/apache/maven/plugin/docck/AbstractCheckDocumentationMojo.java
@@ -232,7 +232,7 @@
     private String buildErrorMessages( Map<MavenProject, DocumentationReporter> reporters )
     {
         String messages = "";
-        StringBuffer buffer = new StringBuffer();
+        StringBuilder buffer = new StringBuilder();
 
         for ( Map.Entry<MavenProject, DocumentationReporter> entry : reporters.entrySet() )
         {