GMP doc: add OBSERVERS/GROUP to CREATE_TASK

[mattmundell]

What

Add GROUP to CREATE_TASK/OBSERVERS in the GMP doc.

Why

Element was missing.

Example

Create task with two GROUP observers.

$ o m m '<create_task> <name>group obs test 2</name> <target id="0de4c2b4-987d-4a3b-9eba-fe92b3eaa8b2"/> <config id="d21f6c81-2b88-4ac1-b7b4-a2a9f2ad4663"/> <observers><group id="986c1365-0435-4cec-aaa0-ed0922aef8e0"/><group id="50e15244-0f7c-4d0d-8a2e-266fa043110c"/></observers> </create_task>'
<create_task_response status="201" status_text="OK, resource created" id="8f068524-687d-4886-a64f-a78dfa8a5526" />

See that permission was created for groups.

o m m '<get_permissions filter="subject_type=group"/>'
<get_permissions_response status="200" status_text="OK">
  <permission id="c1217fe1-f355-424b-acf9-ede5c1e2b89b">
    <name>get_tasks</name>
    <resource id="8f068524-687d-4886-a64f-a78dfa8a5526">
    <subject id="986c1365-0435-4cec-aaa0-ed0922aef8e0">
      <name>test1</name>
      <type>group</type>

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