- unix://path/to/socket should read unix:///path/to/socket like the rest of the documentation (a slash was missing)
 - Mention that [] options may be specified multiple times on the Usage page

Docker-DCO-1.1-Signed-off-by: Mike MacCana <mike.maccana@gmail.com> (github: mikemaccana)

Docker-DCO-1.1-Signed-off-by: Mike MacCana <mike.maccana@gmail.com> (github: SvenDowideit)
add a reference to multiple -H options, and update the other example of -H option

and copy changes to the cli.md file

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5372 from SvenDowideit/docs-tweaks-to-socket-options

Docs tweaks to socket options