chore: expanded at_hash explanation in IT and EN

[rglauco]

Title

Content

Review

• [ ] Ensure your files are written following RST specs (not MD!)
• [x] Italian version
• [x] English version
• [ ] Example files
• [x] Ask for review

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Name	Status	Preview	Comments	Updated (UTC)
spid-cie-oidc-docs	❌ Failed (Inspect)			Jun 19, 2023 10:26am