docs: update link to main branch from barebones

Author: marissahuysentruyt

2nd-gen/packages/swc/.storybook/guides/welcome.mdx

@@ -26,7 +26,7 @@ SWC is currently in transition from its first generation (1st-gen) to its second
 
 2nd-gen SWC is currently in active development, with the first pre-releases expected in early 2026.
 
-For more information on 2nd-gen plans and status, see the [CONTRIBUTOR-DOCS](https://github.com/adobe/spectrum-web-components/tree/barebones/CONTRIBUTOR-DOCS/README.md) in the [SWC repository](https://github.com/adobe/spectrum-web-components).
+For more information on 2nd-gen plans and status, see the [CONTRIBUTOR-DOCS](https://github.com/adobe/spectrum-web-components/tree/main/CONTRIBUTOR-DOCS/README.md) in the [SWC repository](https://github.com/adobe/spectrum-web-components).
 
 ## About these Guides