Added documentation for the 'services' parameter to the Server Groups Add Node API

[MarkTickner]

No description provided.

[cb-docs-robot]

Content is up for review at http://docs-build.sc.couchbase.com/server/1457.
Changed files:

• http://docs-build.sc.couchbase.com/server/1457/rest-api/rest-servergroup-post-add.html

If any of the links return a 404, then the file is not in the ditamap.

[mattcarabine]

Hey @MarkTickner, thanks for the contribution and apologies that this was missing before!

The change looks good so I'll get it backported to the other release branches and then merge it.

[mattcarabine]

@cb-docs-robot backport to 4.5

[mattcarabine]

@cb-docs-robot backport to master

[cb-docs-robot]

Change(s) successfully backported to 4.5 - see #1458.

[cb-docs-robot]

Change(s) successfully backported to master - see #1459.

[mattcarabine]

I will also backport to 4.1 and 4.0, but need to do manually. Your change should be live on the site when we next push the content to production, which should be later today.