multi: fix various typos in comments

lnrpc/rpc.pb.go

@@ -404,7 +404,7 @@ func (*ChangePasswordResponse) Descriptor() ([]byte, []int) { return fileDescrip
 type Transaction struct {
 	// / The transaction hash
 	TxHash string `protobuf:"bytes,1,opt,name=tx_hash" json:"tx_hash,omitempty"`
-	// / The transaction ammount, denominated in satoshis
+	// / The transaction amount, denominated in satoshis
 	Amount int64 `protobuf:"varint,2,opt,name=amount" json:"amount,omitempty"`
 	// / The number of confirmations
 	NumConfirmations int32 `protobuf:"varint,3,opt,name=num_confirmations" json:"num_confirmations,omitempty"`

lnrpc/rpc.proto

@@ -636,7 +636,7 @@ message Transaction {
     /// The transaction hash
     string tx_hash = 1 [ json_name = "tx_hash" ];
 
-    /// The transaction ammount, denominated in satoshis
+    /// The transaction amount, denominated in satoshis
     int64 amount = 2 [ json_name = "amount" ];
 
     /// The number of confirmations

lnrpc/rpc.swagger.json

@@ -2672,7 +2672,7 @@
         "amount": {
           "type": "string",
           "format": "int64",
-          "title": "/ The transaction ammount, denominated in satoshis"
+          "title": "/ The transaction amount, denominated in satoshis"
         },
         "num_confirmations": {
           "type": "integer",