[Github] Update documentation containing audit log prerequisites

[kcreddy]

What does this PR do?

Updates documentation with additional prerequisites for Audit Log such as Enterprise Cloud and also read:audit_log scope permissions

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes [Github] Update prerequisites needed for audit log datastream #6422

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• Start Time: 2023-06-07T18:46:51.533+0000

• Duration: 16 min 48 sec

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Failed	0
Passed	34
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Total	34

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (5/5)	💚
Files	100.0% (5/5)	💚 5.556
Classes	100.0% (5/5)	💚 5.556
Methods	100.0% (64/64)	💚 13.131
Lines	93.815% (986/1051)	👍 7.236
Conditionals	100.0% (0/0)	💚

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Package github - 1.12.2 containing this change is available at https://epr.elastic.co/search?package=github