BigAnimal - Added cross-CSP witness group and data groups as per UPM-…

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product_docs/docs/biganimal/release/overview/02_high_availability.mdx

@@ -76,7 +76,15 @@ A true active-active solution that protects against regional failures, a two dat
 
    ![region(2 data + 1 shadow) + region(2 data + 1 shadow) + region(1 witness)](images/Multi-Region-3Nodes.png)
 
+### Cross-Cloud Service Providers(CSP) data groups
 
+Cross-CSP witness groups are available with AWS, Azure and GCP, on BYOA and BAH. It is enabled by default and applies to both multi-region configurations available with PGD. The database price is not charged for witness groups, it is charged for the infrastructure it uses. The cost of the cross-CSP witness group is reflected in the pricing estimate footer.
+
+By default, the CSP selected for the data groups is pre-selected for the witness group. Now users can change the CSP of the witness group to be one of the other two CSPs.
+
+### Cross-Cloud Service Providers(CSP) witness groups
+
+Users select the CSP for their data groups at the time of creating the data group, before selecting the number of nodes. The default selected CSP is AWS. Once user selects the CSP for the first data group, it is automatically selected for the next created data groups and the witness group. Users can't edit the CSP after creating the cluster.
 
 ## For more information