Fix docs about what protocol must be allowed for network encryption
Fix docs about what protocol must be allowed for network encryption

- This was inadvertently changed to `port`

Signed-off-by: Alessandro Boch <5bd2eb5b6f60921d9a2b9cb6a0a86bb947f3d361@docker.com>

johnstep/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io,johnstep/docker.github.io,thaJeztah/docker.github.io,anweiss/docker.github.io,shubheksha/docker.github.io,docker-zh/docker.github.io,JimGalasyn/docker.github.io,shubheksha/docker.github.io,shin-/docker.github.io,bdwill/docker.github.io,docker-zh/docker.github.io,shin-/docker.github.io,JimGalasyn/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,LuisBosquez/docker.github.io,joaofnfernandes/docker.github.io,bdwill/docker.github.io,docker/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,joeuo/docker.github.io,shubheksha/docker.github.io,anweiss/docker.github.io,bdwill/docker.github.io,joaofnfernandes/docker.github.io,joeuo/docker.github.io,johnstep/docker.github.io,JimGalasyn/docker.github.io,bdwill/docker.github.io,LuisBosquez/docker.github.io,LuisBosquez/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,LuisBosquez/docker.github.io,phiroict/docker,docker-zh/docker.github.io,joeuo/docker.github.io,phiroict/docker,JimGalasyn/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,joaofnfernandes/docker.github.io,shin-/docker.github.io,joaofnfernandes/docker.github.io,joeuo/docker.github.io,shubheksha/docker.github.io,thaJeztah/docker.github.io,docker-zh/docker.github.io,phiroict/docker,londoncalling/docker.github.io,johnstep/docker.github.io,joaofnfernandes/docker.github.io,phiroict/docker,anweiss/docker.github.io,shin-/docker.github.io,johnstep/docker.github.io,anweiss/docker.github.io,joeuo/docker.github.io,anweiss/docker.github.io,docker-zh/docker.github.io,shubheksha/docker.github.io,shin-/docker.github.io,LuisBosquez/docker.github.io,bdwill/docker.github.io,phiroict/docker,docker/docker.github.io