✏️ Fix error in `docs/en/docs/contributing.md` (#12899)

diff --git a/docs/en/docs/contributing.md b/docs/en/docs/contributing.md
index a29bb03e98edd6f47717ed7c648c29080cbd30ea..1b70a0ea93d6604aaffe8e1b134f9bd93b4603d6 100644 (file)
--- a/docs/en/docs/contributing.md
+++ b/docs/en/docs/contributing.md
@@ -107,7 +107,7 @@ $ cd docs/en/
 Then run `mkdocs` in that directory:
 
 ```console
-$ mkdocs serve --dev-addr 8008
+$ mkdocs serve --dev-addr 127.0.0.1:8008
 ```
 
 ///
@@ -245,7 +245,7 @@ $ cd docs/es/
 Then run `mkdocs` in that directory:
 
 ```console
-$ mkdocs serve --dev-addr 8008
+$ mkdocs serve --dev-addr 127.0.0.1:8008
 ```
 
 ///