Fix JavaDoc build (#4637)

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

bundles/org.openhab.core.model.core/src/main/java/org/openhab/core/model/core/ModelRepository.java

@@ -101,7 +101,6 @@ public interface ModelRepository {
      * @param out the output stream to write the generated syntax to
      * @param modelType the model type
      * @param modelContent the content of the model
-     * @return the corresponding syntax
      */
     void generateSyntaxFromModel(OutputStream out, String modelType, EObject modelContent);
 }

bundles/org.openhab.core.thing/src/main/java/org/openhab/core/thing/fileconverter/AbstractThingFileGenerator.java

@@ -100,7 +100,7 @@ public abstract class AbstractThingFileGenerator implements ThingFileGenerator {
      * as in this configuration description, and any parameter having the default value is ignored.
      * If not, the parameters are provided sorted by natural order of their names.
      *
-     * @param thing the channel
+     * @param channel the channel
      * @param hideDefaultParameters true to hide the configuration parameters having the default value
      * @return the sorted list of configuration parameters for the channel
      */