DS-2363 Remove mentions of categoricals in documentation
DS-2363 Remove mentions of categoricals in documentation

Change-Id: I374709a8bb6759fd2e6c9221212e1120e297748c

deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor,deepsense-io/seahorse-workflow-executor