Unresolved references in reference documentation

[mp911de]

Unresolved directive in reference/observability.adoc - include::../observability/_conventions.adoc[]

Unresolved directive in reference/observability.adoc - include::../observability/_metrics.adoc[]

Unresolved directive in reference/observability.adoc - include::../observability/_spans.adoc[]

https://docs.spring.io/spring-data/redis/docs/current/reference/html/#redis.observability