fix(demo): fixed typos and added clarifications (#50)

Author: PingXie

samples/langchain_quick_start.ipynb

@@ -289,7 +289,7 @@
     "    print(\"Found an existing Memorystore for Redis Instance!\")\n",
     "else:\n",
     "    print(\"Creating a new Memorystore for Redis instance...\")\n",
-    "    !gcloud beta redis instances create --region {region} {instance_name} --size {instance_size_gb} --zone {zone} --tier BASIC --redis-version=redis_7_2"
+    "    !gcloud beta redis instances create --region {region} {instance_name} --size {instance_size_gb} --tier BASIC --redis-version=redis_7_2"
    ]
   },
   {
@@ -340,7 +340,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "To connect to your Redis instance, you'll need to establish an SSH tunnel using port forwarding through your Google Compute Engine (GCE) VM."
+    "To connect to your Redis instance, you'll need to establish an SSH tunnel using port forwarding through your Google Compute Engine (GCE) VM. Use the following command in your terminal window:"
    ]
   },
   {
@@ -350,7 +350,7 @@
    "outputs": [],
    "source": [
     "redis_ip = !gcloud beta redis instances describe {instance_name} --region {region} --format=\"value(host)\"\n",
-    "!gcloud compute ssh --project={project_id} --zone={region}-a {vm_name} -- -NL 6379:{redis_ip}:6379"
+    "!gcloud compute ssh --project={project_id} --zone={zone} {vm_name} -- -NL 6379:{redis_ip}:6379"
    ]
   },
   {