Remove commands that use locally unzipped terraform executable

An updated GCP disk image is being used that has Terraform 0.12 installed, so it
is not necessary to download Terraform and run it from a local directory.

Author: topfunky

getting-started/gcp/cloudshell_tutorial.md

@@ -4,28 +4,40 @@
 
 ### Download
 
+Terraform v0.12 is installed in this disk image. If you need to download Terraform, it's available at this link:
+
 [Download Terraform](https://www.terraform.io/downloads.html)
 
+To download, use a command line tool like `wget` on Linux or Mac:
+
 ```
 wget https://releases.hashicorp.com/terraform/0.12.2/terraform_0.12.2_linux_amd64.zip
 ```
 
 ### Unzip
 
+Unzip the Terraform executable:
+
 ```
 unzip terraform_*
 ```
 
 ### Verify version
 
+Verify that you are running Terraform 0.12 or greater.
+
 ```
-./terraform version
+terraform version
 ```
 
+You should see `v0.12.2` or greater in the output.
+
 ```
 Terraform v0.12.2
 ```
 
+If you are using a locally downloaded version if Terraform in the current directory, use `./terraform` (leading dot slash) to run the command.
+
 NOTE: On any error, verify that you're using Terraform `0.12` or greater with `./terraform version`
 
 ### Optional: Skip to final code in `after` branch
@@ -79,19 +91,19 @@ resource "google_compute_network" "vpc_network" {
 ### Init
 
 ```
-./terraform init
+terraform init
 ```
 
 ### Plan
 
 ```
-./terraform plan
+terraform plan
 ```
 
 ### Apply
 
 ```
-./terraform apply
+terraform apply
 ```
 
 You should see:
@@ -129,7 +141,7 @@ resource "google_compute_firewall" "default" {
 ```
 
 ```
-./terraform apply
+terraform apply
 ```
 
 ### Define a compute instance
@@ -162,7 +174,7 @@ resource "google_compute_instance" "vm_instance" {
 ### Show state
 
 ```
-./terraform show
+terraform show
 ```
 
 Scroll up to `network_interface` and `access_config` and `nat_ip`. You'll find an IP address something like `0.0.0.0`.
@@ -205,7 +217,7 @@ git checkout -t origin/after
 ## Destroy
 
 ```
-./terraform destroy
+terraform destroy
 ```
 
 ```