3.x: Patch out duplicate @NonNull annotation in generated javadocs (#7073)
3.x: Patch out duplicate @NonNull annotation in generated javadocs (#7073)

* 3.x: Patch out duplicate @NonNull annotation in generated javadocs

* Replace different pattern for Javadocs 8
ReactiveX/RxJava,ReactiveX/RxJava,reactivex/rxjava,reactivex/rxjava