docs: fix javadoc warnings

Close #141

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/addons/googlemaps/GoogleMap.java

@@ -592,7 +592,7 @@ public boolean isBrowserHasGeolocationSupport() {
  * Adds a CurrentLocationEvent listener. The listener is called when setting the current location.
  *
  * @param listener
- * @return
+ * @return a handle that can be used for removing the listener
  */
  public Registration addCurrentLocationEventListener(
  ComponentEventListener<CurrentLocationEvent> listener) {
@@ -604,7 +604,7 @@ public Registration addCurrentLocationEventListener(
  * found.
  *
  * @param listener
- * @return
+ * @return a handle that can be used for removing the listener
  */
  public Registration addGeolocationErrorEventListener(
  ComponentEventListener<GeolocationErrorEvent> listener) {
@@ -705,7 +705,7 @@ public void setClusteringRenderer(String customRenderer) {
  * pan or zoom)
  *
  * @param listener
- * @return
+ * @return a handle that can be used for removing the listener
  */
  public Registration addMapIdleListener(ComponentEventListener<GoogleMapIdleEvent> listener) {
  DomListenerRegistration registration =
@@ -726,7 +726,7 @@ public GoogleMapIdleEvent(GoogleMap source, boolean fromClient) {
  * zoomed
  *
  * @param listener
- * @return
+ * @return a handle that can be used for removing the listener
  */
  public Registration addGoogleMapBoundsChangedListener(
  ComponentEventListener<GoogleMapBoundsChangedEvent> listener) {

src/main/java/com/flowingcode/vaadin/addons/googlemaps/GoogleMapPoly.java

@@ -182,7 +182,7 @@ public Registration addClickListener(
  }
 
  /**
- * @deprecated, use {@link #setIcons(IconSequence...)} instead.
+ * @deprecated Use {@link #setIcons(IconSequence...)} instead.
  */
  @Deprecated
  public void setIcons(Icon... icons) {

src/main/java/com/flowingcode/vaadin/addons/googlemaps/Icon.java

@@ -7,9 +7,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  * http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -25,7 +25,7 @@
 import java.util.Optional;
 
 /**
- * @deprecated, use {@link IconSequence} instead.
+ * @deprecated Use {@link IconSequence} instead.
  */
 @Deprecated
 public class Icon extends Symbol {
@@ -34,9 +34,9 @@ public class Icon extends Symbol {
 
  public Icon(String path, String strokeColor, String fillColor, int fillOpacity, int repeat) {
  super(path);
- this.setStrokeColor(strokeColor);
- this.setFillColor(fillColor);
- this.setFillOpacity(Double.valueOf(fillOpacity));
+ setStrokeColor(strokeColor);
+ setFillColor(fillColor);
+ setFillOpacity(Double.valueOf(fillOpacity));
  this.repeat = repeat;
  }