doc improvement.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@12415 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/FilePath.java

@@ -519,7 +519,7 @@ public final class FilePath implements Serializable {
     }
 
     /**
-     * Creates a temporary file.
+     * Creates a temporary file in the directory that this {@link FilePath} object designates.
      */
     public FilePath createTempFile(final String prefix, final String suffix) throws IOException, InterruptedException {
         try {