chore: Updated README for CK (#3052)

Fixes: #3051  

Updating the Upgrade Guide links in the README in CK.

[category:Documentation]

README.md

@@ -105,13 +105,15 @@ recommend against using it in production until the first stable version has been
 - [Contributing](https://workday.github.io/canvas-kit/?path=/docs/guides-contributing--page)
 - [Code of Conduct](https://workday.github.io/canvas-kit/?path=/docs/guides-contributing--page#code-of-conduct)
 - Upgrade Guides:
-  - [v4.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v4-0--page)
-  - [v5.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v5-0--page)
-  - [v6.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v6-0--page)
-  - [v7.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v7-0--page)
-  - [v8.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v8-0--page)
-  - [v9.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v9-0--page)
-  - [v10.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v10-0--page)
+  - [v4.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v4-0--docs)
+  - [v5.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v5-0--docs)
+  - [v6.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v6-0--docs)
+  - [v7.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v7-0--docs)
+  - [v8.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v8-0--docs)
+  - [v9.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v9-0--docs)
+  - [v10.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v10-0--docs)
+  - [v11.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v11-0--docs)
+  - [v12.0 Upgrade Guide](https://workday.github.io/canvas-kit/?path=/docs/guides-upgrade-guides-v12-0--docs)
 - Code Style / Best Practices:
   - [API & Pattern Guidelines](https://workday.github.io/canvas-kit/?path=/docs/guides-api-pattern-guidelines--page)
   - [Compound Components](https://workday.github.io/canvas-kit/?path=/docs/guides-compound-components--page)