Add screenshot showing empty Namespace for each claim

What does this MR do?

Adds to the example SAML Azure screenshots showing the empty namespace required for each attribute claim.
The (new?) azure default seems to be with the namespace filled out as in this example:

With the namespace default configuration in each claim, JIT provisioning failed with the error: There is already a gitlab account associated with this email address. Sign in with your existing credentials....etc

Have not been able to identify where (if anywhere) that this is mentioned in our doc's. So this might need to be mentioned somewhere else also, but the screen shot alone would have helped me in my lab configuration so it's a good first step I think.

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