docs: add type to the code of some md files (#3460)

Author: FAKER-A

docs/api/README.md

@@ -289,11 +289,11 @@ Since it's just a component, it works with `<transition>` and `<keep-alive>`. Wh
 
   Signature:
 
-  ```
+  ```ts
   type PositionDescriptor =
     { x: number, y: number } |
     { selector: string } |
-    ?{}
+    void
 
   type scrollBehaviorHandler = (
     to: Route,

docs/fr/api/README.md

@@ -221,11 +221,11 @@ Le composant `<router-view>` est un composant fonctionnel qui fait le rendu du c
 
   Signature :
 
-  ```
+  ```ts
   type PositionDescriptor =
     { x: number, y: number } |
     { selector: string } |
-    ?{}
+    void
 
   type scrollBehaviorHandler = (
     to: Route,

docs/ja/api/README.md

@@ -268,11 +268,11 @@ name ではないプロパティも描画されるコンポーネントに渡さ
 
   シグネチャ:
 
-  ```
+  ```ts
   type PositionDescriptor =
     { x: number, y: number } |
     { selector: string } |
-    ?{}
+    void
 
   type scrollBehaviorHandler = (
     to: Route,

docs/ru/api/README.md

@@ -268,11 +268,11 @@ sidebar: auto
 
   Сигнатура:
 
-  ```
+  ```ts
   type PositionDescriptor =
     { x: number, y: number } |
     { selector: string } |
-    ?{}
+    void
 
   type scrollBehaviorHandler = (
     to: Route,

docs/zh/api/README.md

@@ -270,11 +270,11 @@ sidebar: auto
 
   签名:
 
-  ```
+  ```ts
   type PositionDescriptor =
     { x: number, y: number } |
     { selector: string } |
-    ?{}
+    void
 
   type scrollBehaviorHandler = (
     to: Route,