Update service.md

[ponypaver]

adjust grammar

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[ponypaver]

I signed it

[sftim]

Good spot!

With the style guide in mind, can I suggest:

Suggested change

	server will return a 422 HTTP status code to indicate that there's a problem.
	server returns a 422 HTTP status code to indicate that there's a problem.

[sftim]

That's essentially a nit, and this is also OK to merge as is, so:
/lgtm

[poothia]

lgtm

[xiangpengzhao]

/assign @ryanmcginnis

[ryanmcginnis]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ryanmcginnis

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