Removed useless dependencies

SwingUtilities/src/main/java/fr/soleil/lib/project/swing/text/FilteredCharactersDocument.java

@@ -16,10 +16,8 @@ package fr.soleil.lib.project.swing.text;
 
 import java.util.Arrays;
 
-import javax.swing.text.PlainDocument;
-
 /**
- * A {@link PlainDocument} that may accept only some characters, or refuse these characters.
+ * An {@link AFilteredDocument} that may accept only some characters, or refuse these characters.
  * 
  * @author Raphaël GIRARDOT
  */