message: docs(angular): fix v6 version typo
diff: @@ -32,7 +32,7 @@ The Ionic team generally recommends the latest releases of third party packages
  | Framework | Required Angular Version | TypeScript |
  |:---------:|:------------------------:|:----------:|
  -| v6 | v11+ | 4.0+ |
  +| v6 | v12+ | 4.0+ |
  | v5 | v8.2+ | 3.5+ |
  | v4 | v8.2+ | 3.5+ |
  | v3 | v5.2.11 | 2.6.2 |
  