Improve javadoc for some addons (#15701)

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

bundles/org.openhab.binding.dsmr/src/main/java/org/openhab/binding/dsmr/internal/device/connector/DSMRSerialSettings.java

@@ -21,10 +21,12 @@ import org.openhab.core.io.transport.serial.SerialPort;
  * This class does store 4 serial parameters (baudrate, databits, parity, stopbits)
  * for use in {@link DSMRSerialConnector}.
  *
- * This class can also convert a string setting (<speed> <databits><parity><stopbits>)
+ * This class can also convert a string setting
+ * ({@code <speed> <databits><parity><stopbits>})
  * to a {@link DSMRSerialSettings} object (e.g. 115200 8N1)
  *
  * @author M. Volaart - Initial contribution
+ * 
  * @author Hilbrand Bouwkamp - Removed auto detecting state checking from this class.
  */
 @NonNullByDefault

bundles/org.openhab.binding.dsmr/src/main/java/org/openhab/binding/dsmr/internal/device/cosem/CosemObjectType.java

@@ -206,7 +206,7 @@ public enum CosemObjectType {
      *
      * e.g. If the list contains 4 descriptors and the last 2 are repeating, idx=6 will return the 4th descriptor.
      *
-     * The idx is < 0 or outside a non-repeating descriptorslist size null is returned
+     * The idx {@code is < 0} or outside a non-repeating descriptorslist size null is returned
      *
      * @param idx the CosemValueDescriptor to return
      * @return the CosemValueDescriptor or null if not found.