[RN] Add notes that describes the removal of problematic language for RN 7.4

Add the following to the RN: 

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. We are beginning with these four terms: master, slave, blacklist, and whitelist. Because of the enormity of this endeavor, these changes will be implemented gradually over several upcoming releases. For more details, see link:[https://www.redhat.com/en/blog/making-open-source-more-inclusive-eradicating-problematic-language|https://www.redhat.com/en/blog/making-open-source-more-inclusive-eradicating-problematic-language[our][ our CTO Chris Wright's message].

example: https://access.redhat.com/documentation/en-us/red_hat_build_of_quarkus/1.7/html/release_notes_for_red_hat_build_of_quarkus_1.7/making-open-source-more-inclusive