Corrected typo in IUserTwoFactorTokenProvider.cs

- Corrected typo: "heck" should be "check"

src/Microsoft.Extensions.Identity.Core/IUserTwoFactorTokenProvider.cs

@@ -24,7 +24,7 @@ namespace Microsoft.AspNetCore.Identity
         /// <remarks>
         /// The <paramref name="purpose"/> parameter allows a token generator to be used for multiple types of token whilst
         /// insuring a token for one purpose cannot be used for another. For example if you specified a purpose of "Email" 
-        /// and validated it with the same purpose a token with the purpose of TOTP would not pass the heck even if it was
+        /// and validated it with the same purpose a token with the purpose of TOTP would not pass the check even if it was
         /// for the same user.
         /// 
         /// Implementations of <see cref="IUserTwoFactorTokenProvider{TUser}"/> should validate that purpose is not null or empty to
@@ -60,4 +60,4 @@ namespace Microsoft.AspNetCore.Identity
         /// </returns>
         Task<bool> CanGenerateTwoFactorTokenAsync(UserManager<TUser> manager, TUser user);
     }
-}
+}