docs: Broken link to multistage-build.md if JavaScript is disabled

[vi]

File: engine/userguide/eng-image/dockerfile_best-practices.md, CC @MistyHacks

you can use [multi-stage](!) builds to

[mdlinville]

There are a few links to the multi-stage build topic from that file and they all work for me. The link may appear broken if you are browsing the source on Github and relying on Github's preview, but the content was meant to be viewed from https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/.

If you do find one that is broken, please re-open this with more details. Thanks!

[vi]

Yes, the linked page contains the broken link if JavaScript is disabled.

Expected: https://docs.docker.com/engine/userguide/eng-image/multistage-build/
Actual:   https://docs.docker.com/engine/userguide/eng-image/multistage-build.md

After enabling JavaScript the link becomes normal.

[mdlinville]

This is expected. Our site is not really functional without Javascript.

[vi]

Then a banner like "This site is better be viewed with JavaScript enabled" should be displayed, like on StackOverflow.

[mdlinville]

cc/ @johndmulhausen

[docker-robott]

Closed issues are locked after 30 days of inactivity.
This helps our team focus on active issues.

If you have found a problem that seems similar to this, please open a new issue.

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