4.x: DOC Helidon Testing section is missing in the menu

[danielkec]

And the page itself has wrong maven coordinates:

https://helidon.io/docs/v4/#/se/testing

Incorrect coordinates:

<dependency>
    <groupId>io.helidon.testing.junit5</groupId>
    <artifactId>helidon-testing-junit5-webserver</artifactId>
    <scope>test</scope>
</dependency>

But should be:

<dependency>
     <groupId>io.helidon.webserver.testing.junit5</groupId>
     <artifactId>helidon-webserver-testing-junit5</artifactId>
     <scope>test</scope>
</dependency>