Merge pull request #13604 from kalexand-rh/typo4

fixing typo

Author: kalexand-rh

modules/architecture-overview.adoc

@@ -7,7 +7,7 @@
 
 With {product-title} v4, the core story remains unchanged: {product-title} offers
 your developers a set of tools to evolve their applications under operational oversight
-and using Kubernetes to provide application infrastructure. The key change to {product-title}4 is
+and using Kubernetes to provide application infrastructure. The key change to {product-title} 4 is
 that the infrastructure and its management are flexible, automated, and self-managing.
 
 A major difference between {product-title} 3 and {product-title} 4 is that {product-title} 4 uses Operators