remove extra closing parens

Author: scottaddie

aspnetcore/tutorials/signalr.md

@@ -85,7 +85,7 @@ At the end, you'll have a working chat app:
 
 ## Add the SignalR client library
 
-The SignalR server library is included in the ASP.NET Core 3.0 shared framework. The JavaScript client library isn't automatically included in the project. For this tutorial, you use Library Manager (LibMan) to get the client library from *unpkg*. unpkg is a content delivery network (CDN)) that can deliver anything found in npm, the Node.js package manager.
+The SignalR server library is included in the ASP.NET Core 3.0 shared framework. The JavaScript client library isn't automatically included in the project. For this tutorial, you use Library Manager (LibMan) to get the client library from *unpkg*. unpkg is a content delivery network (CDN) that can deliver anything found in npm, the Node.js package manager.
 
 # [Visual Studio](#tab/visual-studio/)
 
@@ -317,7 +317,7 @@ At the end, you'll have a working chat app:
 
 ## Add the SignalR client library	
 
-The SignalR server library is included in the `Microsoft.AspNetCore.App` metapackage. The JavaScript client library isn't automatically included in the project. For this tutorial, you use Library Manager (LibMan) to get the client library from *unpkg*. unpkg is a content delivery network (CDN)) that can deliver anything found in npm, the Node.js package manager.	
+The SignalR server library is included in the `Microsoft.AspNetCore.App` metapackage. The JavaScript client library isn't automatically included in the project. For this tutorial, you use Library Manager (LibMan) to get the client library from *unpkg*. unpkg is a content delivery network (CDN) that can deliver anything found in npm, the Node.js package manager.	
 
 # [Visual Studio](#tab/visual-studio/)