Missing SOLAN_MESSAGE

[dougEfresh]

In UnsignedMessage there is a missing enum SOLANA_MESSAGE (look for BTC_MESSAGE)

    UnsignedMessage:
      type: object
      properties:
        preHash:
          $ref: '#/components/schemas/PreHash'
        content:
          description: |
            Content to sign on. 
            Should be 32 bytes long for ECDSA (hash of the actual message to sign) or any length for EdDSA as prehashing is not required.
          type: string
          example: ababababababababababababababababababbababababababbababababababab
        bip44addressIndex:
          description: BIP44 address index
          type: integer
          example: 0
        bip44change:
          description: BIP44 change index
          type: number
          example: 0
        derivationPath:
          type: array
          description: BIP44 full derivation path
          items:
            type: number
            example:
              - 44
              - 60
              - 0
              - 0
              - 0
        type:
          type: string
          description: |
            Typed Message Signing - message type.

            - EIP191 & EIP712: for ETH and all EVM based assets typed message signing
            - TIP191: For Tron (TRX) typed message signing
            - BTC_MESSAGE: For Bitcoin (BTC) typed message signing
          enum:
            - EIP191
            - EIP712
            - TIP191
            - BTC_MESSAGE
            - SOLANA_MESSAGE ## missing