Trust Model reference fixes

[joelposti]

Fixed Trust Model references in the ARF.

Fixed some of the Trust Model references in the PID Rule Book. I left two references in place because I think an editor needs to resolve those.

Unresolved reference 1

The value of all data elements (both PID attributes and PID metadata) SHALL be valid at the value of the timestamp in the validFrom element in the MSO from ISO/IEC 18013-5 clause 9.1.2.4[^6].

[^6]: As explained in \[TrustModel\], server retrieval, as specified in ISO/IEC 18013-5, SHALL NOT be used for EUDI Wallets.

I did not fix this reference because I did not understand how the footnote relates to the paragraph it is attached to. Additionally, the footnote is outdated because the ARF does not say anything about server retrieval.

Unresolved reference 2

| [TrustModel] | Trust Model for the EUDI Wallet Ecosystem – generic for all use cases, version 0.8.1, 2023-05-25  |

I left the Trust Model reference in chapter 5 References intact because the footnote mentioned above references it.