Remove the adoc description of Groovy verticles from the vertx-core example

[linghengqian]

Read me

Read this first before creating an issue:

• do not use this issue tracker to ask questions, instead use one of these channels. Questions will likely be closed without notice.
• you shall create a feature request only when it is general purpose enough.
• make sure that the feature is not already

Describe the feature

Give the simplest and best explanation.

• Remove the adoc description of Groovy verticles from the vertx-core example. Because classes like https://github.com/vert-x3/vertx-examples/blob/4.x/core-examples/src/main/groovy/verticles/script.groovy have long been moved.
• 
• 

Use cases

A list of use cases this feature will enable and the value it creates.

• Avoid misleading other readers.

Contribution

Who should implement this feature ? are you volunteering for implementing this feature or do you know that is able and willing implement this feature ?

• To be honest, I'm not sure if this part was permanently removed or if it was temporarily removed.

[linghengqian]

• Due to investigation https://github.com/oracle/graalvm-reachability-metadata/issues/117, https://github.com/netty/netty/issues/11369, https://github.com/eclipse-vertx /vert.x/issues/3960 and https://github.com/apache/shardingsphere/issues/21347 have additional findings, so I'm working on this issue.