docs: Update the kafka GSG to use the new kafka roles
docs: Update the kafka GSG to use the new kafka roles

Fixes: #3184
Signed-Off-By: Manali Bhutiyani <f91afadb65fa57d2313cebbfecb7de1f482fe10f@covalent.io>

scanf/cilium,cilium-team/cilium,tklauser/cilium,eloycoto/cilium,scanf/cilium,scanf/cilium,cilium-team/cilium,tgraf/cilium,eloycoto/cilium,tklauser/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,michi-covalent/cilium,scanf/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,eloycoto/cilium,eloycoto/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,eloycoto/cilium,tgraf/cilium,eloycoto/cilium,cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,scanf/cilium