Update how-to-develop-emulator.md

If the "LimitToEndpoint = true" configuration is not added to the CosmosClientOptions and the user is testing locally, the cosmos client never returns a response and just continually spins.  It appears that it just keeps trying to connect, but doesn't timeout correctly or has no limit.  This seems to fix that issue.

Author: Lampei

articles/cosmos-db/how-to-develop-emulator.md

@@ -476,7 +476,8 @@ Use the [Azure Cosmos DB API for NoSQL .NET SDK](nosql/quickstart-dotnet.md) to
     >     {
     >         ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
     >     }),
-    >     ConnectionMode = ConnectionMode.Gateway
+    >     ConnectionMode = ConnectionMode.Gateway,
+    >     LimitToEndpoint = true
     > };
     >
     > using CosmosClient client = new(