Update streaminghub/getting-started.md

[iiweis]

I thought some parts of streaminghub/getting-started.md could be incorrect, so I made some adjustments.

[iiweis]

I thought RemoveAsync should be called first here, but I left it as is.
By the way, in the implementation of samples/ChatApp, RemoveAsync is called first.

MagicOnion/samples/ChatApp/ChatApp.Server/ChatHub.cs

Lines 40 to 41 in e79d6de

	await this.room.RemoveAsync(this.Context);
	this.room.All.OnLeave(this.myName);

[mayuki]

Thank you for the PR!
Since the receiver events is handler-driven, perhaps names like the following would have been better:

• OnJoined
• OnLeft
• OnMessageReceived

[iiweis]

Thank you for the confirmation.

I agree that the suggested name is more intuitive and easier to understand.

However, if we change the name, I believe the sample implementation should also be revised accordingly.
Since this PR is intended for "fixing non-functional parts" and "ensuring consistency in descriptions" within the documentation,
I think it might be better to either merge this PR first and then make the name change, or address it all together in a separate PR.

What are your thoughts on this approach?

[mayuki]

Ah, I see. I hadn't considered this article and ChatApp to be the same thing.
It seems best to just fix the parts that aren't working here.

[iiweis]

I hadn't considered this article and ChatApp to be the same thing.

I see.
In that case, I'll limit the fixes to the parts that aren't working right now.

That said, I personally believe there’s no downside to keeping interface definitions consistent.
So, along with the method name changes, I’d appreciate it if you could also consider future modifications.

[iiweis]

I’ve made the fix.
ToString was written in camelCase and wasn’t working, so I updated it to use userName as an arg instead, which I believe is more appropriate.

[mayuki]

Thanks!