Add Wallet and Key Attestation to terminology #671
Description
As discussed in the comments of openid/OpenID4VC-HAIP#312
The situation as it is now is that
- "Wallet Attestation" is (mostly) capitalised
- "key attestation" is (mostly) lowercase
It would be preferable to
- Add both "Wallet Attestation" and "Key Attestation" to the terminology of this specification
- Consistently capitalise across all specifications (OpenID4VCI and OpenID HAIP)