fix doc links (#221)

Author: jaeopt

README.md

@@ -15,7 +15,7 @@ Optimizely Rollouts is free feature flags for development teams. Easily roll out
 
 ### Using the SDK
 
-See the [Mobile developer documentation](https://docs.developers.optimizely.com/full-stack/docs/implement-the-ios-sdk-310-beta) or [OTT developer documentation](https://docs.developers.optimizely.com/full-stack/docs/implement-the-ios-sdk-310-beta) to learn how to set
+See the [Mobile developer documentation](https://docs.developers.optimizely.com/full-stack/docs/ios-swift-sdk-310-beta) or [OTT developer documentation](https://docs.developers.optimizely.com/full-stack/docs/ios-swift-sdk-310-beta) to learn how to set
 up an Optimizely X project and start using the SDK.
 
 ### Requirements