[8.15] [DOCS][API] Add /api/fleet to Fleet API paths (#192652)

[lcawl]

Backport

This will backport the following commits from main to 8.15:

• [DOCS][API] Add /api/fleet to Fleet API paths (#192652)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[obltmachine]

🤖 GitHub comments

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[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: f6914db

Failed CI Steps

Metrics [docs]

✅ unchanged

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@elasticmachine merge upstream