fix：highlight ts code (type-challenges#29746)

Author: NameWjp

questions/00956-hard-deeppick/README.md

@@ -6,8 +6,7 @@ A type takes two arguments.
 
 For example:
 
-```
-
+```ts
 type obj = {
   name: 'hoge', 
   age: 20,
@@ -28,4 +27,4 @@ type T3 = DeepPick<obj, 'name' | 'friend.name' |  'friend.family.name'>  // { na
 ```
 
 
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