Fix documentation for compile time dependency injection

[asdcdow]

SwaggerApplicationLoader went away

[wanghongenpin]

Hello, where do you add this code?
val swaggerPlugin = new SwaggerPluginImpl(lifecycle, router, app) // Can't be lazy because of PlayApiScanner initialization side effect
+lazy val apiHelpController = new ApiHelpController(components, configuration)

[asdcdow]

I assume you have a class like MyComponents in this guide. You would put those lines inside that class.