Create resource - Resource identifier placeholder and info text

Create resource field Resource identifier could use a better placeholder than URN. It's very rarely in use, and any form is supported.

We could put various examples to an info field, if it had one.


Start from the create-resource form entry point and inspect how the Resource identifier field is rendered; the issue does not name a file or test. Replace the current URN placeholder with a more suitable example or generic prompt, and add an info field with examples if the form supports it; verify the result against the supplied screenshot and the create-resource flow.

Written by the indexing model from the issue text.