[JJasonSun]

Summary

Fix the README tool-flow diagram by replacing a semicolon in its note with a comma. Mermaid treats the semicolon as a statement separator, which causes GitHub to reject the diagram. Also remove the redundant sentence above the supported-regions table.

README.md
  Tool flow: valid Mermaid note
  Country-code introduction
  Supported-regions table

Evidence

• Before: GitHub displayed Unable to render rich display and a parse error on line 12 of the tool-flow diagram.
• After: the GitHub branch preview renders the full sequence diagram, including the polling loop. The extra language-table sentence is absent.
• The docs site's existing Regions parser accepts the README; all 22 table rows are unchanged. git diff --check passes.

Merge Danger

Door: two-way. The documentation edit can be reverted.

Blast Radius: documentation. Only the root README changes.

Release decision: No release needed; no packages, version bump, or changeset.