Fix text auditor typo batch

[Lucas-FManager]

Summary

• Fixes the repeated rsa.network.alias_host punctuation/contraction typo across the listed package field definitions and generated docs.
• Fixes the remaining cloud.account.id and Elasticsearch typos in docs/extend.

Root cause

The issue grouped concrete user-facing text defects: a duplicated sentence typo family plus two remaining contributor-doc typos.

Code shape

This is a mechanical text-only change. I kept the edit scoped to the current actionable items and intentionally did not touch dev/import-beats/variables_compact.go because that tool was noted as deprecated in the issue thread. I also left general-guidelines.md alone because the issue thread says it was already fixed in #19120.

Security assessment

Low risk: no executable code, dependencies, generated credentials, auth flow, or data parsing changed. The update only corrects static documentation and field-description text.

Verification

• rg -n "clear\.Also|isnt ad\.computer|cloud\.acount\.id|Elasticseach" packages docs returns no matches.
• rg -n "clear\. Also|isn't ad\.computer|cloud\.account\.id|Elasticsearch instance" packages docs
• git diff --check

Note: elastic-package is not installed in my local environment, so I could not run package-level checks here.

Fixes #18743

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💚 CLA has been signed

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Pinging @elastic/integration-experience (Team:Integration-Experience)

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