PDFBOX-5660: improve javadoc

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1922882 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

examples/src/main/java/org/apache/pdfbox/examples/pdmodel/RemoveFirstPage.java

@@ -23,7 +23,10 @@
 import java.io.IOException;
 
 /**
- * This is an example on how to remove pages from a PDF document.
+ * This is an example on how to remove pages from a PDF document. Do not use this tool if other
+ * pages link to this one or if your document has a structure tree for accessibility unless you are
+ * able to fix these as well. In such cases it is better to use the splitter() class which will do
+ * these fixes.
  *
  * @author Ben Litchfield
  */