GMP doc: add GROUPS to CREATE_USER

[mattmundell]

What

Add GROUPS to CREATE_USER in the GMP doc.

Why

Element was missing.

Example

Create user, adding to group:

$ o m m '<create_user><name>test8</name><password>test</password><groups><group id="986c1365-0435-4cec-aaa0-ed0922aef8e0"/></groups></create_user>'
<create_user_response status="201" status_text="OK, resource created" id="c95ba093-ab3f-4d78-9533-546242c4b31e" />

Confirm in group:

$ o m m '<get_users user_id="c95ba093-ab3f-4d78-9533-546242c4b31e"/>'
<get_users_response status="200" status_text="OK">
  <user id="c95ba093-ab3f-4d78-9533-546242c4b31e">
    <groups>
      <group id="986c1365-0435-4cec-aaa0-ed0922aef8e0">
        <name>test1</name>
      </group>
    </groups>

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