JavaDoc: Don't link to classes from "poi-ooxml" in module "poi"

Otherwise building javadoc in CI fails sometimes, maybe if
the repository is cleaned before building.

And add some missing javadoc

poi/src/main/java/org/apache/poi/POIDocument.java

@@ -473,6 +473,7 @@ public abstract class POIDocument implements Closeable {
      * to a new POIFSFileSystem
      *
      * @param newDirectory the new directory
+     * @throws IOException if accessing the file-system fails.
      */
     @Internal
     protected void replaceDirectory(DirectoryNode newDirectory) throws IOException {

poi/src/main/java/org/apache/poi/extractor/ExtractorFactory.java

@@ -47,7 +47,7 @@ import org.apache.poi.util.ThreadLocalUtil;
  * <p>Note 1 - will fail for many file formats if the POI Scratchpad jar is
  *  not present on the runtime classpath</p>
  * <p>Note 2 - for text extractor creation across all formats, use
- *  {@link org.apache.poi.ooxml.extractor.POIXMLExtractorFactory} contained within
+ *  org.apache.poi.ooxml.extractor.POIXMLExtractorFactory contained within
  *  the OOXML jar.</p>
  * <p>Note 3 - rather than using this, for most cases you would be better
  *  off switching to <a href="http://tika.apache.org">Apache Tika</a> instead!</p>
@@ -294,7 +294,7 @@ public final class ExtractorFactory {
     /**
      * Create the Extractor, if possible. Generally needs the Scratchpad jar.
      * Note that this won't check for embedded OOXML resources either, use
-     *  {@link org.apache.poi.ooxml.extractor.POIXMLExtractorFactory} for that.
+     *  org.apache.poi.ooxml.extractor.POIXMLExtractorFactory for that.
      *
      * @param root The {@link DirectoryNode} pointing to a document.
      *
@@ -313,7 +313,7 @@ public final class ExtractorFactory {
     /**
      * Create the Extractor, if possible. Generally needs the Scratchpad jar.
      * Note that this won't check for embedded OOXML resources either, use
-     *  {@link org.apache.poi.ooxml.extractor.POIXMLExtractorFactory} for that.
+     *  org.apache.poi.ooxml.extractor.POIXMLExtractorFactory for that.
      *
      * @param root The {@link DirectoryNode} pointing to a document.
      * @param password The password that is necessary to open the file

poi/src/main/java/org/apache/poi/sl/usermodel/SlideShow.java

@@ -130,7 +130,7 @@ public interface SlideShow<
     /**
      * @return the instance which handles the persisting of the slideshow,
      * which is either a subclass of {@link org.apache.poi.POIDocument}
-     * or {@link org.apache.poi.ooxml.POIXMLDocument}
+     * or org.apache.poi.ooxml.POIXMLDocument
      *
      * @since 4.0.0
      */

poi/src/main/java/org/apache/poi/ss/formula/eval/forked/ForkedEvaluator.java

@@ -36,7 +36,7 @@ import org.apache.poi.ss.usermodel.Workbook;
 /**
  * An alternative workbook evaluator that saves memory in situations where a single workbook is
  * concurrently and independently evaluated many times.  With standard formula evaluation, around
- * 90% of memory consumption is due to loading of the {@link HSSFWorkbook} or {@link org.apache.poi.xssf.usermodel.XSSFWorkbook}.
+ * 90% of memory consumption is due to loading of the {@link HSSFWorkbook} or org.apache.poi.xssf.usermodel.XSSFWorkbook.
  * This class enables a 'master workbook' to be loaded just once and shared between many evaluation
  * clients.  Each evaluation client creates its own {@link ForkedEvaluator} and can set cell values
  * that will be used for local evaluations (and don't disturb evaluations on other evaluators).

poi/src/main/java/org/apache/poi/ss/usermodel/ExtendedColor.java

@@ -20,7 +20,7 @@ import java.util.Locale;
 
 /**
  * Represents a XSSF-style color (based on either a
- *  {@link org.apache.poi.xssf.usermodel.XSSFColor} or a
+ *  org.apache.poi.xssf.usermodel.XSSFColor or a
  *  {@link org.apache.poi.hssf.record.common.ExtendedColor}
  */
 public abstract class ExtendedColor implements Color {

poi/src/main/java/org/apache/poi/ss/usermodel/helpers/RowShifter.java

@@ -30,16 +30,16 @@ import org.apache.poi.util.LocaleUtil;
  * Helper for shifting rows up or down
  */
 // non-Javadoc: This abstract class exists to consolidate duplicated code between
-// {@link org.apache.poi.hssf.usermodel.helpers.HSSFRowShifter} and
-// {@link org.apache.poi.xssf.usermodel.helpers.XSSFRowShifter}
+// org.apache.poi.hssf.usermodel.helpers.HSSFRowShifter and
+// org.apache.poi.xssf.usermodel.helpers.XSSFRowShifter
 // (currently methods sprinkled throughout HSSFSheet)
 public abstract class RowShifter extends BaseRowColShifter {
     protected final Sheet sheet;
 
-    public RowShifter(Sheet sh) { 
-        sheet = sh; 
-    } 
- 
+    public RowShifter(Sheet sh) {
+        sheet = sh;
+    }
+
   /**
      * Shifts, grows, or shrinks the merged regions due to a row shift.
      * Merged regions that are completely overlaid by shifting will be deleted.
@@ -83,7 +83,7 @@ public abstract class RowShifter extends BaseRowColShifter {
                 removedIndices.add(i);
             }
         }
-        
+
         if(!removedIndices.isEmpty()) {
             sheet.removeMergedRegions(removedIndices);
         }