[WebtoolsE2E] [Configure the API with distributed caching] The documentation should be updated to add the 'using' required by the code.

[Coleen17]

Describe the issue or suggestion

Issue description
In Tutorial: Implement caching with .NET Aspire integrations doc, we need to update some instructions.

Issue1:

For Configure the API with distributed caching section, document shows that you need to update the Program.cs file of the xxx.ApiService project using the below command.

EXPECTED
You need to add the "using" required code.

using System.Text;
using System.Text.Json;
using Microsoft.Extensions.Caching.Distributed;

---

Associated WorkItem - 341260