Document @PageTitle not working properly with Quarkus in development mode

[mcollovati]

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The Vaadin Quarkus integration has a known issue with the usage of @PageTitle when the application runs in development mode.
The feature basically does not work because of Quarkus is creating proxy classes to monitor beans, and the annotation is not inheritable. (vaadin/quarkus#67).

A workaround for this is to disable dev-mode monitoring in application.properties (https://quarkus.io/guides/all-config#quarkus-arc_quarkus.arc.dev-mode.monitoring-enabled), at the cost of deactivating monitoring for all beans.

This limitation must be documented in the Known issues section of the add-on documentation.
https://vaadin.com/docs/latest/integrations/quarkus#quarkus.vaadin.knownissues

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