Enhance middleware examples.

docs/content/middlewares/addprefix.md

@@ -9,34 +9,28 @@ The AddPrefix middleware updates the URL Path of the request before forwarding i
 
 ## Configuration Examples
 
-??? example "File -- Prefixing with /foo"
+```yaml tab="Docker"
+# Prefixing with /foo
+labels:
+- "traefik.http.middlewares.add-bar.addprefix.prefix=/foo"
+```
 
-    ```toml
-    [http.middlewares]
-      [http.middlewares.add-foo.AddPrefix]
-         prefix = "/foo"
-    ```
+```yaml tab="Kubernetes"
+apiVersion: traefik.containo.us/v1alpha1
+kind: Middleware
+metadata:
+  name: addprefix
+spec:
+  addprefix:
+    prefix: /bar
+```
 
-??? example "Docker -- Prefixing with /bar"
-
-    ```yaml
-    a-container:
-      image: a-container-image 
-        labels:
-          - "traefik.http.middlewares.add-bar.addprefix.prefix=/bar"
-    ```
-
-??? example "Kubernetes -- Prefixing with /bar"
-
-    ```yaml
-    apiVersion: traefik.containo.us/v1alpha1
-    kind: Middleware
-    metadata:
-      name: addprefix
-    spec:
-      addprefix:
-        prefix: /bar
-    ```
+```toml tab="File"
+# Prefixing with /foo
+[http.middlewares]
+  [http.middlewares.add-foo.AddPrefix]
+     prefix = "/foo"
+```
 
 ## Configuration Options