Removed documentation for "isAppTokenCache" (#237)

Removed documentation for a parameter that no longer exists on a method on the IMsalTokenCacheProvider interface.

Author: NickMoores

Diff for: Microsoft.Identity.Web/TokenCacheProviders/IMsalTokenCacheProvider .cs

@@ -15,8 +15,6 @@ public interface IMsalTokenCacheProvider
         /// Initializes a token cache (which can be a user token cache or an app token cache)
         /// </summary>
         /// <param name="tokenCache">Token cache for which to initialize the serialization</param>
-        /// <param name="isAppTokenCache">Is the token cache an App token cache or
-        /// a user token cache</param>
         /// <returns></returns>
         Task InitializeAsync(ITokenCache tokenCache);