Update comments

.devcontainer/devcontainer.json

@@ -1,15 +1,24 @@
 {
-	"name": "Node.js Sample",
-	"dockerFile": "Dockerfile",
-	"appPort": 3000,
-	"extensions": [
-		"dbaeumer.vscode-eslint"
-	],
-	"settings": {
-		"terminal.integrated.shell.linux": "/bin/bash"
-	},
-	"postCreateCommand": "yarn install",
-	// Comment out the next line to run as root instead. Linux users, update
-	// Dockerfile with your user's UID/GID if not 1000.
-	"runArgs": [ "-u", "node" ]
+    "name": "Node.js Sample",
+    "dockerFile": "Dockerfile",
+
+    // Specifies a list of ports that should be published.
+    "appPort": [3000],
+
+    // Comment out the next line to run as root instead. Linux users, update
+    // Dockerfile with your user's UID/GID if not 1000.
+    "runArgs": [ "-u", "node" ],
+
+	// Use 'settings' to set *default* container specific settings.json values on container create. 
+	// You can edit these settings after create using File > Preferences > Settings > Remote.
+    "settings": {
+        "terminal.integrated.shell.linux": "/bin/bash"
+    },
+
+    // Specifies a command that should be run after the container has been created.
+    "postCreateCommand": "yarn install",
+
+    "extensions": [
+        "dbaeumer.vscode-eslint"
+    ]
 }