text: Title: clean duplications of Xcom backend docs from core
  Body: ### Body
  
  Most of the text in [Object Storage XCom Backend](https://airflow.apache.org/docs/apache-airflow/2.10.5/core-concepts/xcoms.html#object-storage-xcom-backend) is duplicated with [Object Storage XCom Backend (common-io provider)](https://airflow.apache.org/docs/apache-airflow-providers-common-io/1.5.1/xcom_backend.html#object-storage-xcom-backend)
  
  
  The task:
  The core part should give high level explanation and forward to the provider docs for further read.
  Similar to what we do with [Kubernetes](https://airflow.apache.org/docs/apache-airflow/2.10.5/administration-and-deployment/kubernetes.html#kubernetes)  we give high level explanation and forward to additional read in helm chart or provider docs.
  
  
  
  ### Committer
  
  - [x] I acknowledge that I am a maintainer/committer of the Apache Airflow project.