[maven-javadoc-plugin] disable missing warnings

[xhaggi]

Silencing the maven-javadoc plugin.

[WARNING] Javadoc Warnings
[WARNING] /htmx-spring-boot/htmx-spring-boot/src/main/java/io/github/wimdeblauwe/htmx/spring/boot/mvc/HtmxHandlerInterceptor.java:17: warning: no comment
[WARNING] public class HtmxHandlerInterceptor implements HandlerInterceptor {
[WARNING] ^
[WARNING] /htmx-spring-boot/htmx-spring-boot/src/main/java/io/github/wimdeblauwe/htmx/spring/boot/mvc/HtmxHandlerMethodArgumentResolver.java:14: warning: no comment
[WARNING] public class HtmxHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
[WARNING] ^
[WARNING] /htmx-spring-boot/htmx-spring-boot/src/main/java/io/github/wimdeblauwe/htmx/spring/boot/mvc/HtmxHandlerMethodArgumentResolver.java:28: warning: no comment
[WARNING] public static HtmxRequest createHtmxRequest(HttpServletRequest request) {
[WARNING] ^
....