Added Javadoc links for the three libraries (ExpediaGroup#413)

* Added Javadoc links for the three libraries

* fix garbled descriptions

At some point the emdash and description for the first bullet point got moved south. This puts it where it belongs.

docs/getting-started.md

@@ -7,11 +7,11 @@ GraphQL Kotlin consists of number of libraries that aim to simplify running a Gr
 
 ## Modules
 
-* [graphql-kotlin-schema-generator](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/graphql-kotlin-schema-generator)
-* [graphql-kotlin-federation](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/graphql-kotlin-federation)
-  — Schema generator extension to build federated GraphQL schemas
+* [graphql-kotlin-schema-generator](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/graphql-kotlin-schema-generator)  ([Javadoc](https://www.javadoc.io/doc/com.expediagroup/graphql-kotlin-schema-generator))
   — Code only GraphQL schema generation for Kotlin
-* [graphql-kotlin-spring-server](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/graphql-kotlin-spring-server)
+* [graphql-kotlin-federation](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/graphql-kotlin-federation) ([Javadoc](https://www.javadoc.io/doc/com.expediagroup/graphql-kotlin-federation))
+  — Schema generator extension to build federated GraphQL schemas
+* [graphql-kotlin-spring-server](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/graphql-kotlin-spring-server) ([Javadoc](https://www.javadoc.io/doc/com.expediagroup/graphql-kotlin-spring-server))
   — Spring Boot auto-configuration library to create GraphQL web app
 * [examples](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/examples)
   — Example apps that use graphql-kotlin libraries to test and demonstrate usages