fix: edit link in docs (#6182)

dev-docs/docusaurus.config.js

@@ -30,7 +30,8 @@ const config = {
         docs: {
           sidebarPath: require.resolve("./sidebars.js"),
           // Please change this to your repo.
-          editUrl: "https://github.com/excalidraw/docs/tree/master/",
+          editUrl:
+            "https://github.com/excalidraw/excalidraw/tree/master/dev-docs/",
         },
         theme: {
           customCss: [