all: fix spelling errors

rpc/subscription.go

@@ -30,7 +30,7 @@ var (
 	ErrSubscriptionNotFound = errors.New("subscription not found")
 )
 
-// ID defines a psuedo random number that is used to identify RPC subscriptions.
+// ID defines a pseudo random number that is used to identify RPC subscriptions.
 type ID string
 
 // a Subscription is created by a notifier and tight to that notifier. The client can use

rpc/subscription_test.go

@@ -62,7 +62,7 @@ func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val i
 	subscription := notifier.CreateSubscription()
 
 	go func() {
-		// test expects n events, if we begin sending event immediatly some events
+		// test expects n events, if we begin sending event immediately some events
 		// will probably be dropped since the subscription ID might not be send to
 		// the client.
 		time.Sleep(5 * time.Second)

rpc/types.go

@@ -135,7 +135,7 @@ const (
 	LatestBlockNumber  = BlockNumber(-1)
 )
 
-// UnmarshalJSON parses the given JSON fragement into a BlockNumber. It supports:
+// UnmarshalJSON parses the given JSON fragment into a BlockNumber. It supports:
 // - "latest", "earliest" or "pending" as string arguments
 // - the block number
 // Returned errors: