Is your feature request related to a problem? Please describe.
The documentation page for volume encryption contains no information about the encryption algorithms & modes used for encryption in transit or at rest. This information is often required by IT Security managers or compliance authorities.

Describe the solution you'd like
Add a summary about what encryption algorithms are used for both encryption in transit & encryption at rest.

Eg, "Encryption at rest uses AES256 bit in XYZ mode and encryption in transit uses AES256 bit in ABC mode."

Describe alternatives you've considered
I also looked in the longhorn/longhorn repo for this information but can't find what I'm looking for.

Additional context
The documentation page is https://longhorn.io/docs/1.2.2/advanced-resources/volume-encryption/.

Also, it's amazing that encryption was added, very much appreciated.