[Fleet]: Create API key step is missing for standalone agent

[harshitgupta-qasource]

Description:
Create API key step is missing from the standalone agent policy documentation. Users following this guide cannot complete the setup because the instructions for generating the required API key are not included.

Link:
https://www.elastic.co/docs/reference/fleet/create-standalone-agent-policy

Steps to Reproduce

1. Navigate to the Create a standalone agent policy documentation page.
2. Follow the instructions for setting up a standalone agent.
3. Observe that no step covers creating the API key required for the agent.

Screen-shot:

Expected Result

• Create API key step should be available for standalone agent

[harshitgupta-qasource]

@arvindersingh-qasource Kindly review

[arvindersingh-qasource]

Secondary review for this ticket is Done.

[github-actions]

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