moved nonprod and prod vpcs to a separate section

docs/how-to/aws-vpc-setup/shared-vpc.md

@@ -119,6 +119,8 @@ the `tf-cli version` command shows a version less than 1.x.
 
 ### ent-gov internal (ent-gov-network-prod)
 
+### NonProd VPC's
+
 | VPC{n} | Label | Purpose |
 |--------|-------|---------|
 | vpc1 | vpc1-gen-common  | Common applications accessible from any environment (services and shared, possibly, but they belong in an infrastructure account) |
@@ -127,11 +129,18 @@ the `tf-cli version` command shows a version less than 1.x.
 | vpc4 | vpc4-gen-uat     | UAT (User Acceptance Test; a subset of test) | 
 | vpc5 | vpc5-gen-ite     | ITE (Integrated Test Environment; a subset of test) |
 | vpc6 | vpc6-gen-stage   | Stage (performance, stress test) |
-| vpc7 | vpc7-gen-prod    | Production |
 | vpc8 | vpc8-gen-test    | Test (not one of QA, UAT, or ITE) |
 
+### Prod VPC
+
+| VPC{n} | Label | Purpose |
+|--------|-------|---------|
+| vpc7 | vpc7-gen-prod    | Production |
+
 ### ent-gov external (ent-gov-dmz-network-prod)
 
+### NonProd VPC's
+
 | VPC{n} | Label | Purpose |
 |--------|-------|---------|
 | vpc1 | vpc1-dmz-services | Services (infrastructure and enterprise) |
@@ -140,7 +149,12 @@ the `tf-cli version` command shows a version less than 1.x.
 | vpc4 | vpc4-dmz-test     | Test (not one of QA, UAT, or ITE) |
 | vpc5 | vpc5-dmz-ite      | ITE (Integrated Test Environment; a subset of test) |
 | vpc6 | vpc6-dmz-uat      | UAT (User Acceptance Test; a subset of test)  |
-| vpc7 | vpc7-dmz-stage    | Stage (performance, stress test) |
+| vpc7 | vpc7-dmz-stage    | Stage (performance, stress test) 
+
+### Prod VPC
+
+| VPC{n} | Label | Purpose |
+|--------|-------|---------|
 | vpc8 | vpc8-dmz-prod     | Production  |
 
 ### lab-gov internal (lab-gov-network-nonprod)