letsencrypt: Improve docs for Lets Encrypt YAML to help prevent usage + copy/paste errors

[gplasky]

Just documentation updates because we can't enforce a schema on the YAML. This should hopefully help avoid the numerous issues filed for NoneType errors like #3790 #3410 #3661 etc.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Documentation and configuration comments were updated to clarify how users should copy DNS-related YAML attributes into the UI configuration field. The updates emphasize not to include the top-level dns: key to avoid parsing errors, but rather to copy only the attributes beneath it. No functional or structural changes were made.

Changes

File(s)	Change Summary
letsencrypt/DOCS.md	Updated instructions in the "Example Configurations" section to clarify copying only DNS attributes, not the dns: key, for UI configuration.
letsencrypt/config.yaml	Added an internal comment in the dns schema section to instruct users to exclude the dns: key when copying attributes for UI input.

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

letsencrypt/DOCS.md (1)

299-302: Bold the UI string to follow repository doc style

Docs for this repo bold UI labels. Update the sentence to bold DNS Provider configuration and front the goal:

-When using the UI edit mode (which is the default), and configuring DNS, you **must**
-only copy the attributes *underneath* the `dns:` key into the "DNS Provider configuration" field.
+When you configure DNS in UI edit mode (default), **copy only** the attributes *underneath* the `dns:` key into the **DNS Provider configuration** field.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
Cache: Disabled due to data retention organization setting
Knowledge Base: Disabled due to data retention organization setting

📥 Commits

Reviewing files that changed from the base of the PR and between bfd8040 and 1f0dfb4.

📒 Files selected for processing (2)

• letsencrypt/DOCS.md (1 hunks)
• letsencrypt/config.yaml (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

*/**(html|markdown|md)

Instructions used from:

Sources:
⚙️ CodeRabbit Configuration File

🔇 Additional comments (1)

letsencrypt/config.yaml (1)

35-37: UI-specific comment reads well — LGTM

The added guidance is concise, prescriptive, and in the right place to catch copy-paste mistakes. No further adjustments needed.