docs: fix javadoc warnings

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/addons/twincolgrid/TwinColGrid.java

@@ -162,7 +162,7 @@ public enum Orientation {
   private boolean isFromClient = false;
 
   private String layoutId;
-  
+
   private static <T> ListDataProvider<T> emptyDataProvider() {
     return DataProvider.ofCollection(new LinkedHashSet<>());
   }
@@ -308,7 +308,7 @@ public TwinColGrid(@NonNull Grid<T> availableGrid, @NonNull Grid<T> selectionGri
   /**
    * Sets the component caption.
    *
-   * @param captinText the component caption.
+   * @param captionText the component caption.
    */
   public void setCaption(String captionText) {
     if (captionText != null) {
@@ -339,7 +339,7 @@ public String getCaption() {
    * Sets orientation for TwinColGridComponent
    *
    * @param orientation
-   * @return
+   * @return this instance for method chaining.
    */
   public TwinColGrid<T> withOrientation(Orientation orientation) {
     if (this.orientation != orientation) {
@@ -393,10 +393,10 @@ private Component createContainerLayout() {
 
   private String getLayoutId() {
     return Optional.ofNullable(layoutId).orElseGet(()->{
-      return this.layoutId = "twincol-" + UUID.randomUUID();
+      return layoutId = "twincol-" + UUID.randomUUID();
     });
   }
-  
+
   private HorizontalLayout createHorizontalContainer(boolean reverse) {
     buttonContainer = getVerticalButtonContainer();
     HorizontalLayout hl;
@@ -676,7 +676,7 @@ public TwinColGrid<T> addSortableColumn(
    * @param itemLabelGenerator the value provider
    * @param comparator the in-memory comparator
    * @param header the column header
-   * @param header the column key
+   * @param key the column key
    * @return this instance
    */
   public TwinColGrid<T> addSortableColumn(