Add deployment stamps pattern details (#5475)

The description for deployment-stamps in the high-availability section is actually the bulkhead pattern instead of the deployment-stamps pattern. 

The new changes above are from the deployment stamps pattern in the availability section.

src/data/roadmaps/system-design/content/118-cloud-design-patterns/103-reliability-patterns/101-high-availability/deployment-stamps.md

@@ -1,6 +1,6 @@
 # Deployment Stamps
 
-The Bulkhead pattern is a type of application design that is tolerant of failure. In a bulkhead architecture, elements of an application are isolated into pools so that if one fails, the others will continue to function. It's named after the sectioned partitions (bulkheads) of a ship's hull. If the hull of a ship is compromised, only the damaged section fills with water, which prevents the ship from sinking.
+The deployment stamp pattern involves provisioning, managing, and monitoring a heterogeneous group of resources to host and operate multiple workloads or tenants. Each individual copy is called a stamp, or sometimes a service unit, scale unit, or cell. In a multi-tenant environment, every stamp or scale unit can serve a predefined number of tenants. Multiple stamps can be deployed to scale the solution almost linearly and serve an increasing number of tenants. This approach can improve the scalability of your solution, allow you to deploy instances across multiple regions, and separate your customer data.
 
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