change the -H TCP / docker group warning to not reference a resolved issue

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #4171 from SvenDowideit/4061-remote-api-warning

change the -H TCP / docker group warning to not reference a resolved issue