Fix small typo

[ryanwilsonperkin]

- What I did
Noticed a typo in this markdown file: "instead" instead of "in stead"

- How I did it
Github integrated editor 💪

- How to verify it
😉 https://english.stackexchange.com/questions/227644/instead-of-vs-in-stead-of

- Description for the changelog

Typo fix in the docker stats documentation.

- A picture of a cute animal (not mandatory but encouraged)

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "patch-1" git@github.com:ryanwilsonperkin/cli.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[ryanwilsonperkin]

@GordonTheTurtle hi! It seems your account is tied to the dco/no check. I contributed this PR via the Github integrated editor, and so the commit is automatically "verified" by GitHub along with a generated GPG key. Is this now allowed via this dco rule?

[codecov-io]

Codecov Report

Merging #1646 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #1646 +/- ##
======================================
Coverage 56.1% 56.1% ======================================
Files 300 300 Lines 20601 20601 ======================================
Hits 11559 11559 Misses 8209 8209 Partials 833 833

[silvin-lubecki]

Hello @ryanwilsonperkin , thank you for fixing this typo. @GordonTheTurtle is our signed-off bot which checks that every commit has a signed-off section at the end with your real full name.

Signed-off-by: Silvin Lubecki <silvin.lubecki@docker.com>

Can you amend your commit with it?

[thaJeztah]

LGTM, thanks!