Improve javadoc for some addons (#15701)

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.binding.robonect/src/main/java/org/openhab/binding/robonect/internal/RobonectClient.java

@@ -47,7 +47,8 @@ import org.slf4j.LoggerFactory;
 /**
  * The {@link RobonectClient} class is responsible to communicate with the robonect module via it's HTTP interface.
  *
- * The API of the module is documented here: http://robonect.de/viewtopic.php?f=10&t=37
+ * @see <a href="http://robonect.de/viewtopic.php?f=10&t=37">
+ *      http://robonect.de/viewtopic.php?f=10&amp;t=37</a>. The API of the module is documented here.
  *
  * @author Marco Meyer - Initial contribution
  */

bundles/org.openhab.binding.robonect/src/main/java/org/openhab/binding/robonect/internal/model/ErrorEntry.java

@@ -41,7 +41,9 @@ public class ErrorEntry {
     }
 
     /**
-     * @return - the error code. Some codes are documented here: http://www.robonect.de/viewtopic.php?f=11&t=110
+     * @return - the error code. Some codes are documented here:
+     *         <a href="http://www.robonect.de/viewtopic.php?f=11&t=110">
+     *         http://www.robonect.de/viewtopic.php?f=11&amp;t=110</a>
      */
     public Integer getErrorCode() {
         return errorCode;

bundles/org.openhab.binding.robonect/src/main/java/org/openhab/binding/robonect/internal/model/cmd/StatusCommand.java

@@ -17,7 +17,8 @@ import org.openhab.binding.robonect.internal.model.MowerStatus;
 /**
  * Queries the mowers status. The status holds a lot of status information.
  * See {@link MowerStatus}
- * or the documentation at: http://www.robonect.de/viewtopic.php?f=11&t=38
+ * or the documentation at <a href="http://www.robonect.de/viewtopic.php?f=11&t=38">
+ * http://www.robonect.de/viewtopic.php?f=11&amp;t=38</a>
  * 
  * @author Marco Meyer - Initial contribution
  */