Override context value for node library

Author: jfoskin

src/connections/sources/catalog/libraries/server/node/index.md

@@ -634,6 +634,23 @@ const analytics = new Analytics({
   httpClient: new CustomClient() 
 })
 ```
+##Override Context Value
+```
+analytics.track({
+  anonymousId: '48d213bb-95c3-4f8d-af97-86b2b404dcfe',
+  event: 'New Test',
+  properties: {
+    revenue: 39.95,
+    shippingMethod: '2-day'
+  },
+  context: {
+    traits: {
+      "email": "[email protected]"
+    }
+  }
+});
+```
+
 
 ## Troubleshooting