docs: fix Let's Encrypt product name

[ravindudanthanarayana]

Purpose

Correct the product name of Let's Encrypt to match the official branding and improve documentation consistency.

Approach

Updated the documentation to replace LetsEncrypt with Let's Encrypt.

Related Issues

N/A

Checklist

• Tests added or updated (unit, integration, etc.)
• Samples updated (if applicable)
• Added backport/<release-branch> label if this should be backported (e.g., backport/release-v1.0)

Remarks

Documentation-only change.

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📥 Commits

Reviewing files that changed from the base of the PR and between e1e301b and 853e393.

📒 Files selected for processing (1)

• en/docs/get-started/concepts/integration-cloud-concepts.md

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[github-actions]

Broken links, images & orphan pages

✅ Passing — no broken links or images found.

Links/images come from one crawl of the production build (baseUrl-aware). Orphans are docs not referenced by sidebars.ts.

Summary

• Broken links & images — total 0 · 🆕 introduced 0 · 📄 already on main 0
• Orphan pages — total 8 · 🆕 introduced 0 · 📄 already on main 8

Broken links & images

Introduced by this PR

No new broken link(s)/image(s) introduced by this PR. ✅

Already on main — 0 total

None.

Orphan pages

Introduced by this PR

No new orphan page(s) introduced by this PR. ✅

Already on main — 8 total

Already present on the base branch (not caused by this PR):

Show 8

• docs/deploy-operate/observe/datadog-integration
• docs/deploy-operate/observe/elastic-stack-elk
• docs/deploy-operate/observe/metrics-prometheus-grafana
• docs/deploy-operate/observe/opensearch-integration
• docs/deploy-operate/observe/recipe-elk-stack
• docs/deploy-operate/observe/recipe-kubernetes-production
• docs/deploy-operate/observe/recipe-local-development
• docs/deploy-operate/observe/recipe-opensearch-setup