[19.03] Included named pipe mounts documentation

[olljanat]

Proposed changes

Added documentation about named pipe mounts.

Related issues (optional)

This documentation was requested on docker/cli/pull/1195

[GordonTheTurtle]

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[thaJeztah]

Thanks! I found some small issues (commented inline).

So, this documentation change is for the next release (19.03), so should not be merged yet; I added [19.03] to the title so that the documentation maintainers know it's not to be merged yet; alternatively, you can change the PR to target the vnext-engine branch (which is a branch for upcoming releases); to do so; click the edit button;

And switch the target branch:

(I'm not sure if the vnext-engine branch is currently fully up-to-date: @ahh-docker is that branch still used by the docs team?)

[olljanat]

@thaJeztah commit is now updated but I did change base from vnext-engine back to master as it looks to be quite lot of behind.

Btw. Do you know if there plan to publish 19.03 version of Docker EE? I'm just curious as that is version what is used by Windows Servers.

[bermudezmt]

@thaJeztah Sorry for the delayed response, and thank you for updating the title. I have added a new label, content/unreleased for tracking purposes.

You are correct @olljanat - we haven't worked with vnext branches in almost a year; so using master as your base branch was the right call. Thank you for your patience - we will be merging this as soon as the code release is confirmed.

[thaJeztah]

LGTM

[adrian-plata]

Merged, thank you for contributing!