Fix a typo in for deploy ASC in vnet

Author: gavinfish

articles/spring-cloud/how-to-deploy-in-azure-virtual-network.md

@@ -164,7 +164,7 @@ This table shows the maximum number of app instances Azure Spring Cloud supports
 | /25             | 128       | 120           | <p> App with 1 core:  500<br> App with 2 cores:  500<br>  App with 3 cores:  480<br>  App with 4 cores: 360</p> |
 | /24             | 256       | 248           | <p> App with 1 core:  500<br/> App with 2 cores:  500<br/>  App with 3 cores: 500<br/>  App with 4 cores: 500</p> |
 
-For subnets, five IP addresses are reserved by Azure, and at least three IP addresses are required by Azure Spring Cloud. At least nine IP addresses are required, so /29 and /30 are nonoperational.
+For subnets, five IP addresses are reserved by Azure, and at least three IP addresses are required by Azure Spring Cloud. At least eight IP addresses are required, so /29 and /30 are nonoperational.
 
 For a service runtime subnet, the minimum size is /28. This size has no bearing on the number of app instances.