Fix typo

Author: LorenzCK

OAuthUniversalApp/OAuthUniversalApp/MainPage.xaml.cs

@@ -208,12 +208,12 @@ public static string randomDataBase64url(uint length)
         /// 
         /// Returns the SHA256 hash of the input string.
         /// 
-        /// inputStirng">
+        /// inputString">
         /// 
-        public static IBuffer sha256(string inputStirng)
+        public static IBuffer sha256(string inputString)
         {
             HashAlgorithmProvider sha = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha256);
-            IBuffer buff = CryptographicBuffer.ConvertStringToBinary(inputStirng, BinaryStringEncoding.Utf8);
+            IBuffer buff = CryptographicBuffer.ConvertStringToBinary(inputString, BinaryStringEncoding.Utf8);
             return sha.HashData(buff);
         }