docs: use master branch for mermaid url

Author: PaulRBerg

website/docs/guides/markdown-features/markdown-features-diagrams.mdx

@@ -82,4 +82,4 @@ module.exports = {
 };
 ```
 
-See the [Mermaid config documentation](https://mermaid-js.github.io/mermaid/#/./Setup?id=configuration) and the [Mermaid config types](https://github.com/mermaid-js/mermaid/blob/v9.4.3/packages/mermaid/src/config.type.ts) for the available config options.
+See the [Mermaid config documentation](https://mermaid-js.github.io/mermaid/#/./Setup?id=configuration) and the [Mermaid config types](https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/config.type.ts) for the available config options.