[Typo] Fixes typo in Parse/Internal/Json.cs
[Typo] Fixes typo in Parse/Internal/Json.cs

Fixes a typo in Parse/Internal/Json.cs
wujun4code/Parse-SDK-dotNET,AmeliaMesdag/Parse-SDK-dotNET,ParsePlatform/Parse-SDK-dotNET,ParsePlatform/Parse-SDK-dotNET,wujun4code/Parse-SDK-dotNET,AmeliaMesdag/Parse-SDK-dotNET