Update service_create.md

[jescobar-docker]

Typo in word 'propagation'.

- What I did
Correct a typo
- How I did it
N/A
- How to verify it
N/A
- Description for the changelog

It was just a typo being corrected.

- 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:jescobar-docker/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.

[codecov-io]

Codecov Report

Merging #2054 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #2054 +/- ##
=======================================
Coverage 56.78% 56.78% =======================================
Files 311 311 Lines 21836 21836 =======================================
Hits 12400 12400 Misses 8520 8520 Partials 916 916

[albers]

LGTM, thanks.

[thaJeztah]

LGTM, thanks!