docs(upgrading/v6): add linux example in Update imports section (#12420)

Author: sealer3

contributors.yml

@@ -242,6 +242,7 @@
 - saul-atomrigs
 - sbolel
 - scarf005
+- sealer3
 - senseibarni
 - sergiodxa
 - sgalhs

docs/upgrading/v6.md

@@ -329,6 +329,12 @@ Instead of manually updating imports, you can use this command. Make sure your g
 find ./path/to/src \( -name "*.tsx" -o -name "*.ts" -o -name "*.js" -o -name "*.jsx" \) -type f -exec sed -i '' 's|from "react-router-dom"|from "react-router"|g' {} +
 ```
 
+If you have GNU `sed` installed (most Linux distributions), use this command instead:
+
+```shellscript nonumber
+find ./path/to/src \( -name "*.tsx" -o -name "*.ts" -o -name "*.js" -o -name "*.jsx" \) -type f -exec sed -i 's|from "react-router-dom"|from "react-router"|g' {} +
+```
+
 👉 **Update DOM-specific imports**
 
 `RouterProvider` and `HydratedRouter` come from a deep import because they depend on `"react-dom"`: