[Fleet] updated doc link to remote ES output

[juliaElastic]

Summary

Related to #104986

Updated doc link to the new remote ES output doc.
Leads to https://www.elastic.co/guide/en/fleet/master/monitor-elastic-agent.html#external-elasticsearch-monitoring

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• /oblt-deploy-serverless : Deploy a serverless Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[kilfoyle]

LGTM! Thanks for fixing this doc link.

[nchaulet]

🚀

[sphilipse]

approving for CI auto-commit

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 06d23fa

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
fleet	1.2MB	1.2MB	+14.0B
lists	148.0KB	148.1KB	+83.0B
total			+97.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
core	374.4KB	374.5KB	+83.0B

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @juliaElastic