docs(doc): add v1.1 upgrade guide

[gandalf-at-lerian]

Summary

• Adds the retroactive minor upgrade guide for from to .
• Patch-only upgrade docs remain ignored, per task scope.

Requested by: @guimoreirar

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 9b662133-2063-4a4b-8b1d-58380bdac2e6

📥 Commits

Reviewing files that changed from the base of the PR and between 3766751 and babca74.

📒 Files selected for processing (1)

• charts/plugin-bc-correios/docs/UPGRADE-1.1.md

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