remove comment

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1902936 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/poi-ooxml/src/test/java/org/apache/poi/xslf/usermodel/TestXSLFDiagram.java b/poi-ooxml/src/test/java/org/apache/poi/xslf/usermodel/TestXSLFDiagram.java
index c3ae9c4..21dadf5 100644
--- a/poi-ooxml/src/test/java/org/apache/poi/xslf/usermodel/TestXSLFDiagram.java
+++ b/poi-ooxml/src/test/java/org/apache/poi/xslf/usermodel/TestXSLFDiagram.java
@@ -41,8 +41,7 @@
                 .map(s -> (XSLFDiagram) s)
                 .collect(Collectors.toList());
     }
-
-    // https://stackoverflow.com/a/3607942
+    
     private static String colorToHex(Color color) {
         return String.format("#%02x%02x%02x", color.getRed(), color.getGreen(), color.getBlue());
     }