Merge pull request #4202 from segmentio/niallzato-patch-2

Document multiple instance support

Author: stayseesong

src/connections/sources/catalog/libraries/mobile/swift-ios/index.md

@@ -455,6 +455,20 @@ Segment supports these destinations for Analytics Swift, with more to come:
 No, only the plugins listed above are supported in device-mode for Analytics-Swift.
 ### Will I still see device-mode integrations listed as `false` in the integrations object?
 When you successfully package a plugin in device-mode, you will no longer see the integration listed as `false` in the integrations object for a Segment event. This logic is now packaged in the event metadata, and is not surfaced in the Segment debugger.
+### Does the Analytics-Swift mobile library support multiple instances of Segment on the device?
+The Analytics-Swift mobile library supports multiple instances of Segment on the device. For example, you may wish to send some events to one source and other events to another:
+```swift
+let configuration1 = Configuration(writeKey: "WRITE_KEY1")
+.trackApplicationLifecycleEvents(true)
+.flushInterval(10)
+
+let configuration2 = Configuration(writeKey: "WRITE_KEY2")
+.trackApplicationLifecycleEvents(false)
+.flushInterval(1)
+
+analytics1 = Analytics(configuration: configuration1)
+analytics2 = Analytics(configuration: configuration2)
+```
 
 ## Changelog
 [View the Analytics-Swift changelog on GitHub](https://github.com/segmentio/analytics-swift/releases){:target="_blank"}.