[O11y][MongoDB Atlas] Update documentation for alert data stream

[harnish-elastic]

• Bugfix

Proposed commit message

• Update documentation for alert data stream.

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[elastic-vault-github-plugin-prod]

🚀 Benchmarks report

Package mongodb_atlas 👍(0) 💚(0) 💔(8)

Expand to view

Data stream	Previous EPS	New EPS	Diff (%)	Result
alert	3968.25	2958.58	-1009.67 (-25.44%)	💔
disk	20408.16	8264.46	-12143.7 (-59.5%)	💔
hardware	34482.76	15873.02	-18609.74 (-53.97%)	💔
mongod_audit	8849.56	5434.78	-3414.78 (-38.59%)	💔
mongod_database	30303.03	12658.23	-17644.8 (-58.23%)	💔
organization	4566.21	2092.05	-2474.16 (-54.18%)	💔
process	4132.23	1930.5	-2201.73 (-53.28%)	💔
project	5681.82	2109.7	-3572.12 (-62.87%)	💔

To see the full report comment with /test benchmark fullreport

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 18ba27f

History

• 💔 Build #25276 failed cb976d1
• 💔 Build #25274 failed 9727362
• 💔 Build #25020 failed 2318555
• 💔 Build #25011 failed bd0f9a5
• 💔 Build #24983 failed 3414ff8

cc @harnish-elastic

[botelastic]

Hi! We just realized that we haven't looked into this PR in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!