Refactor and add VPC variable references

Signed-off-by: Prajyot-Parab <[email protected]>

docs/book/src/SUMMARY.md

@@ -22,3 +22,4 @@
 - [Troubleshooting](./user/troubleshooting.md)
 - [Reference](./reference/reference.md)
   - [Regions-Zones Mapping](./reference/regions-zones-mapping.md)
+  - [VPC Variables](./reference/vpc-variables.md)

docs/book/src/reference/vpc-variables.md

@@ -0,0 +1,8 @@
+# VPC Variables
+
+- [IBMVPC_REGION](/reference/regions-zones-mapping.html)
+- [IBMVPC_ZONE](/reference/regions-zones-mapping.html)
+- [IBMVPC_RESOURCEGROUP](https://cloud.ibm.com/docs/account?topic=account-rgs&interface=ui)
+- [IBMVPC_IMAGE_ID](https://cloud.ibm.com/docs/vpc?topic=vpc-planning-custom-images)
+- [IBMVPC_PROFILE](https://cloud.ibm.com/docs/vpc?topic=vpc-profiles&interface=ui)
+- [IBMVPC_SSHKEY_ID](https://cloud.ibm.com/docs/vpc?topic=vpc-managing-ssh-keys&interface=ui)

docs/book/src/topics/vpc/creating-a-cluster.md

@@ -32,7 +32,7 @@ following the steps below.
     kubeadmconfigtemplate.bootstrap.cluster.x-k8s.io/ibm-vpc-5-md-0 created
     ```
 
-    Note: Refer [Regions-Zones Mapping](/reference/regions-zones-mapping.html) for more information.
+    Note: Refer [VPC Variables](/reference/vpc-variables.html) for more detailed information.
 
 2. Check the state of the provisioned cluster and machine objects within the local management cluster