docs(hsm): pkcs11 key requirements

[varonix0]

Description 📣

Added key attribute requirements to the HSM documentation along with some general structural improvements to the HSM doc.

Type ✨

• [ ] Bug fix
• [ ] New feature
• [ ] Improvement
• [ ] Breaking change
• [x] Documentation

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• [x] I have read the contributing guide, agreed and acknowledged the code of conduct. 📝

[maidul98]

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