Update JSON.swift

Sources/Cache/JSON.swift

@@ -5,15 +5,19 @@ import c
 
  To create a `JSON` object, pass a `Data` object that contains JSON data to the `init(data:)` method. You can then use the `get(_:)` or `resolve(_:)` method to extract individual values from the JSON data.
 
+```swift
 let jsonData = "{\"name\": \"John Doe\", \"age\": 42}".data(using: .utf8)!
 let json = JSON<MockJSONKey>(data: jsonData)
 
 let name: String = try json.resolve(.name)
 let age: Int = try json.resolve(.age)
+```
 
  You can also use the `set(value:forKey:)` method to update the values in the JSON object, and the `get(_:)` or `resolve(_:)` method to retrieve the values from the object.
 
+```swift
 json.set(value: "Jane Doe", forKey: .name)
 let newName: String = try json.resolve(.name)
+```
 */
 public typealias JSON = c.JSON