Fix some Javadoc links like apache#442

This commit uses the idea of the PR but not its implementation

Author: garydgregory

src/changes/changes.xml

@@ -44,6 +44,7 @@
       <!-- ADD -->
       <!-- FIX -->
       <action type="update" dev="ggregory" due-to="Gary Gregory">Fix PMD issues for port to PMD 7.1.0.</action>
+      <action type="update" dev="ggregory" due-to="Dávid Szigecsán, Gary Gregory">Fix some Javadoc links #442.</action> 
       <!-- UPDATE -->
       <action type="update" dev="ggregory" due-to="Dependabot">Bump commons-codec:commons-codec from 1.16.1 to 1.17.0 #422.</action>
       <action type="update" dev="ggregory" due-to="Gary Gregory"> Bump org.apache.commons:commons-parent from 69 to 71 #435.</action>

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

@@ -26,6 +26,8 @@
 import java.io.IOException;
 import java.io.Reader;
 
+import org.apache.commons.io.IOUtils;
+
 /**
  * A special buffered reader which supports sophisticated read access.
  * <p>
@@ -84,7 +86,7 @@ long getCurrentLineNumber() {
      * Returns the last character that was read as an integer (0 to 65535). This will be the last character returned by
      * any of the read methods. This will not include a character read using the {@link #lookAhead()} method. If no
      * character has been read then this will return {@link Constants#UNDEFINED}. If the end of the stream was reached
-     * on the last read then this will return {@link Constants#EOF}.
+     * on the last read then this will return {@link IOUtils#EOF}.
      *
      * @return the last character that was read
      */

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

@@ -22,6 +22,8 @@
 import java.io.Closeable;
 import java.io.IOException;
 
+import org.apache.commons.io.IOUtils;
+
 /**
  * Lexical analyzer.
  */
@@ -467,7 +469,7 @@ boolean readEndOfLine(int ch) throws IOException {
      * On return, the next character is available by calling {@link ExtendedBufferedReader#getLastChar()}
      * on the input stream.
      *
-     * @return the unescaped character (as an int) or {@link Constants#EOF} if char following the escape is
+     * @return the unescaped character (as an int) or {@link IOUtils#EOF} if char following the escape is
      *      invalid.
      * @throws IOException if there is a problem reading the stream or the end of stream is detected:
      *      the escape character is not allowed at end of stream