Title: Migrating from 6.0.x to 6.1

Describe the issue: In section Modify Remote Class API Code there are two examples for creating runtime engine. One for 6.0 and one for 6.1 branch. There is missing type declaration in both.

In first there is "remoteRuntimeEngine = rjmsreBuilder.build();". There should be "RemoteRuntimeEngine remoteRuntimeEngine = rjmsreBuilder.build();"

In second one there is "remoteRuntimeEngine = rjmsreBuilder.build();". There should be "RuntimeEngine remoteRuntimeEngine = rjmsreBuilder.build();"

There is also a mistake in text that is before the second example. There is written "This code should be modified as the Remote Class API has been migrated to a new package: org.kie.api.runtime.manager.RuntimeEngine". But org.kie.api.runtime.manager.RuntimeEngine is a class not a package. This should be corrected. There should be something like this: "This code should be modified as the Remote Class API defines new generalized interface for remote runtime engine: org.kie.api.runtime.manager.RuntimeEngine".

Suggestions for improvement:

Additional information: