Update on-gcp-compute-engine.md (#18643)

All caps SSH throws an error from gcloud now. Changed to lowercase ssh.

docs/deploying-airbyte/on-gcp-compute-engine.md

@@ -44,7 +44,7 @@ gcloud --project $PROJECT_ID compute instances list
 5. Connect to your instance in your local terminal:
 
 ```bash
-gcloud --project=$PROJECT_ID beta compute SSH $INSTANCE_NAME
+gcloud --project=$PROJECT_ID beta compute ssh $INSTANCE_NAME
 ```
 
 6. Install Docker on your VM instance by following the below commands in your VM terminal:
@@ -81,7 +81,7 @@ To install and launch Airbyte:
 1. In your local terminal, connect to your Google Cloud instance:
 
 ```bash
-gcloud --project=$PROJECT_ID beta compute SSH $INSTANCE_NAME
+gcloud --project=$PROJECT_ID beta compute ssh $INSTANCE_NAME
 ```
 
 2. In your VM terminal, install Airbyte:
@@ -101,7 +101,7 @@ Warning: For security reasons, we strongly recommended not exposing Airbyte publ
 1. In your local terminal, create an SSH tunnel to connect the GCP instance to Airbyte:
 
 ```bash
-gcloud --project=$PROJECT_ID beta compute SSH $INSTANCE_NAME -- -L 8000:localhost:8000 -N -f
+gcloud --project=$PROJECT_ID beta compute ssh $INSTANCE_NAME -- -L 8000:localhost:8000 -N -f
 ```
 
 2. Verify the connection by visiting [http://localhost:8000](http://localhost:8000) in your browser.