Fix wrong link

Author: cwickham

docs/authoring/diagrams.qmd

@@ -94,7 +94,7 @@ There are a variety of tools available to improve your productivity authoring di
 
 3)  [RStudio](https://www.rstudio.com/products/rstudio/download/) includes support for editing and previewing `.mmd` and `.dot` files (with help from the [DiagrammeR](https://rich-iannone.github.io/DiagrammeR/) package).
 
-4)  The [Quarto VS Code Extension](https://marketplace.visualstudio.com/items?itemName=quarto.quarto) (also bundled with Positron from [Open VSX](https://open-vsx.org/extension/sumneko/lua)) supports live preview of diagrams embedded in `.qmd` files and in `.mmd` and `.dot` files:
+4)  The [Quarto VS Code Extension](https://marketplace.visualstudio.com/items?itemName=quarto.quarto) (also bundled with Positron from [Open VSX](https://open-vsx.org/extension/quarto/quarto) supports live preview of diagrams embedded in `.qmd` files and in `.mmd` and `.dot` files:
 
     ![](images/vscode-graphviz.gif){.border fig-alt="A Quarto document being edited in Visual Studio Code, with a live preview of the currenly edited diagram shown in a pane to the right"}