clef: documentation generator + docs (#19020)

* clef: implement documentation generation + remove unused struct

* clef: formatting + spelling

* clef: updates to doc

signer/core/api.go

@@ -236,12 +236,6 @@ type (
 	Message struct {
 		Text string `json:"text"`
 	}
-	PasswordRequest struct {
-		Prompt string `json:"prompt"`
-	}
-	PasswordResponse struct {
-		Password string `json:"password"`
-	}
 	StartupInfo struct {
 		Info map[string]interface{} `json:"info"`
 	}

signer/core/signed_data.go

@@ -250,7 +250,7 @@ func (api *SignerAPI) determineSignatureFormat(ctx context.Context, contentType
 				message := []*NameValueType{
 					{
 						Name:  "message",
-						Typ:   "text/plain",
+						Typ:   accounts.MimetypeTextPlain,
 						Value: msg,
 					},
 				}

signer/core/types.go

@@ -75,7 +75,7 @@ type SendTxArgs struct {
 	Nonce    hexutil.Uint64           `json:"nonce"`
 	// We accept "data" and "input" for backwards-compatibility reasons.
 	Data  *hexutil.Bytes `json:"data"`
-	Input *hexutil.Bytes `json:"input"`
+	Input *hexutil.Bytes `json:"input,omitempty"`
 }
 
 func (args SendTxArgs) String() string {