Change: GMP doc: correct nvt and nvt_id in GET_NOTES

[mattmundell]

What

Correct the filter columns nvt and nvt_id for GET_NOTES in the GMP doc.

Why

nvt is actually for an NVT name.

For example:

o m m '<get_notes filter="nvt=1.3.6.1.4.1.25623.1.0.10049"/>'
<get_notes_response status="200" status_text="OK">
  <filtered>0</filtered>

versus:

time o m m '<get_notes filter="nvt=Count.cgi"/>'
<get_notes_response status="200" status_text="OK">
  <note id="d0be5b1b-90d0-4dc7-9aa0-a9b80ed7f136">
    <nvt oid="1.3.6.1.4.1.25623.1.0.10049">
    ...
  <filtered>1</filtered>

[github-actions]

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