fingerprint-ed25519 file is not documented in the manpage FILES section

The file fingerprint-ed25519 got added in #30642 (closed) but the man page has not been updated for it.

When adding this entry the description of the fingerprint file should get more specific.

DataDirectory/fingerprint Only used by servers. Contains the fingerprint of the server’s identity key.

..the fingerprint of the server's RSA identity key.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information