docs: add Groovy Docker-Client link

Docker-DCO-1.1-Signed-off-by: Tobias Gesellchen <tobias@gesellix.de> (github: gesellix)
Fix "Error while reading file" Fish completion

An unbalanced single quote caused Fish to fail to load the completion file with `source: Error while reading file “/etc/fish/completions/docker.fish”`.

Docker-DCO-1.1-Signed-off-by: Andrew France <andrew@avito.co.uk> (github: Odaeus)
Merge pull request #6852 from Odaeus/patch-1

Fix "Error while reading file" in Fish completion
Fix the parent/child relationship in the docs

In the Docker Linking Docs, the parent child relationship
was backwards. The Web container should be able to access
the DB, not other way around. Furthermore, the output of
'docker ps' was wrong (it showed that the DB could access
the Web). This fixes both typos.

Docker-DCO-1.1-Signed-off-by: Ian Bull <irbull@gmail.com> (github: irbull)
run.md: Fix references to cli

There are now no other occurrences of `#cli-` in this document.

TODO: Find other places with wrong links.
Merge pull request #6860 from felixrabe/patch-7

run.md: Fix references to cli
Merge pull request #6846 from irbull/master

Fix the parent/child relationship in the docs
Merge pull request #6840 from gesellix/patch-1

docs: add Groovy Docker-Client link