Removing quarkus-panache-common annotation processor from docs

[edeandrea]

https://github.com/quarkusio/quarkus/wiki/Migration-Guide-3.9#ormhrmongo-panache-annotation-processor-removed states that there is no longer a need for the quarkus-panache-common annotation processor, yet it is still there in the docs. This PR removes it from the docs.

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[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit c5890c7.

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It should be safe to merge provided you have a look at the other checks in the summary.

[FroMage]

I was absolutely convinced I did that already at the time, now I wonder where the commit went… Thanks anyway.

[github-actions]

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