standardized port and also included pre-req for all notebooks

docs/zero_to_hero_guide/04_Memory101.ipynb

@@ -23,11 +23,31 @@
     "Prerequisites:\n",
     "\n",
     "Basic Python knowledge\n",
-    "A running instance of the Memory API server (we'll use localhost in this tutorial)\n",
+    "A running instance of the Memory API server (we'll use localhost in \n",
+    "this tutorial)\n",
+    "\n",
+    "Before you begin, please ensure Llama Stack is installed and set up by following the [Getting Started Guide](https://llama-stack.readthedocs.io/en/latest/getting_started/index.html).\n",
     "\n",
     "Let's start by installing the required packages:"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Set up your connection parameters:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "HOST = \"localhost\"  # Replace with your host\n",
+    "PORT = 5001        # Replace with your port"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,