Fix spelling issues (#396)

* fix typo handler.go

* fix json.go

* fix typo server.go

* fix storage_key.go

gethrpc/handler.go

@@ -275,7 +275,7 @@ func (h *handler) handleResponse(msg *jsonrpcMessage) {
 		return
 	}
 	// For subscription responses, start the subscription if the server
-	// indicates success. EthSubscribe gets unblocked in either case through
+	// indicates success. EthSubscribe gets unblocked in either case though
 	// the op.resp channel.
 	defer close(op.resp)
 	if msg.Error != nil {

gethrpc/json.go

@@ -43,7 +43,7 @@ type subscriptionResult struct {
 	Result json.RawMessage `json:"result,omitempty"`
 }
 
-// A value of this type can a JSON-RPC request, notification, successful response or
+// A value of this type can be a JSON-RPC request, notification, successful response or
 // error response. Which one it is depends on the fields.
 type jsonrpcMessage struct {
 	Version string          `json:"jsonrpc,omitempty"`

gethrpc/server.go

@@ -36,7 +36,7 @@ const (
 	// OptionMethodInvocation is an indication that the codec supports RPC method calls
 	OptionMethodInvocation CodecOption = 1 << iota
 
-	// OptionSubscriptions is an indication that the codec suports RPC notifications
+	// OptionSubscriptions is an indication that the codec supports RPC notifications
 	OptionSubscriptions = 1 << iota // support pub sub
 )
 

types/storage_key.go

@@ -80,7 +80,7 @@ func CreateStorageKey(meta *Metadata, prefix, method string, args ...[]byte) (St
 
 	// From metadata >= v14, there is only one representation of Map,
 	// which is more alike the old 'NMap': a Map with n keys (n >= 1).
-	// The old variants are now unified as thus IsMap() is true for all.
+	// The old variants are now unified thus IsMap() is true for all.
 	if entryMeta.IsMap() {
 		hashers, err := entryMeta.Hashers()
 		if err != nil {