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

[linghengqian]

Read me

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• 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.
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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 Add Support for io.vertx:vertx-core:4.3.5 oracle/graalvm-reachability-metadata#117, BouncyCastle ALPN seems to break native image builds netty/netty#11369, https://github.com/eclipse-vertx /vert.x/issues/3960 and Make ShardingSphere Proxy in GraalVM Native Image form available apache/shardingsphere#21347 have additional findings, so I'm working on this issue.