docs: Add reference to KIP that implemented the built-in provider (#13)

I think that it will help users to learn more about the background Signed-off-by: Yeikel <email@yeikel.com>
strimzi · Jul 2, 2024 · a89b9c4 · a89b9c4
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 # Deprecation notice
 
-This project is now deprecated as since Kafka 3.5.0, Kafka has a built-in EnvVar Configuration Provider. 
+This project is now deprecated as since Kafka 3.5.0, Kafka implemented a built-in EnvVar Configuration Provider with [KIP-887](https://cwiki.apache.org/confluence/display/KAFKA/KIP-887%3A+Add+ConfigProvider+to+make+use+of+environment+variables). 
 
 To migrate from Strimzi provider to Kafka's, you need to change the class to `org.apache.kafka.common.config.provider.EnvVarConfigProvider`.