Javadoc and don't use FQCN in throws clause.

Author: garydgregory

src/main/java/org/apache/commons/csv/Lexer.java

@@ -216,7 +216,7 @@ private char mapNullToDisabled(final Character c) {
      * @param token
      *            an existing Token object to reuse. The caller is responsible to initialize the Token.
      * @return the next token found.
-     * @throws java.io.IOException on stream access error.
+     * @throws IOException on stream access error.
      */
     Token nextToken(final Token token) throws IOException {