Update networking.md

grammar

Docker-DCO-1.1-Signed-off-by: Andre Dublin <81dublin@gmail.com> (github: andredublin)

rebased by

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #6157 from SvenDowideit/pr_out_update_networking_md

Update networking.md