Update getting-started-for-web.phtml

[chexxor]

What does this PR do?

As a newbie to Appwrite, it wasn't clear where to find the Project Id. I thought the name of my project, "MyProject", was sufficient, but it wasn't and it caused me to get a CORS error when trying to use my project. Later, I discovered the "Project ID" tag was clickable, and it gave me my project Id.

This proposed change would be an improvement, as it shows the expected format of a project id. The best change would be a UI change in the project overview page of the Appwrite Web UI.

I mentioned this in the general channel in Discord and it sounded like you'd like to have this improved, so here's a start on that.

Test Plan

None

Related PRs and Issues

None

Have you read the Contributing Guidelines on issues?

I did not. The change seems small enough it's not necessary.