Update README.md

Author: glibnub

README.md

@@ -217,7 +217,7 @@ Then, based on that code, the following modifications were applied. [This commit
 - Added a `NaiveSessionCache` class in a new Utils folder which serves as a token cache which livetime is the duration of the session. Updated the `Startup.cs` file accordingly to add sessions.
 - Added a `TodoListController` and a `Todo` view, as well as a "Todo List" entry in the toolbar of the Web API. This is where most of the interesting code is
 - Updated the `SignOut()` method of the `AccountController` to clear the cache for the user when s/he signs-out.
-- Updated `AzureAdAuthenticationBuilderExtensions.cs` to request an authorization code, and redeem it, getting an access token to the Azure AD graph (https://graph.windows.com), so that the token cache contains a token for the user. This token will be used by the `TodoController` to request another token for the TodoListService
+- Updated `AzureAdAuthenticationBuilderExtensions.cs` to request an authorization code, and redeem it, getting an access token to the Azure AD graph (`https://graph.windows.com`), so that the token cache contains a token for the user. This token will be used by the `TodoController` to request another token for the TodoListService
 
 This scenario is slightly different than the same scenario in ASP.NET (not Core).  Note the following line in *AzureAdAuthenticationBuilderExtensions.cs*: