all: fix typos in comments (#21118)

eth/downloader/downloader.go

@@ -724,7 +724,7 @@ func (d *Downloader) findAncestor(p *peerConnection, remoteHeader *types.Header)
 	// If we're doing a light sync, ensure the floor doesn't go below the CHT, as
 	// all headers before that point will be missing.
 	if d.mode == LightSync {
-		// If we dont know the current CHT position, find it
+		// If we don't know the current CHT position, find it
 		if d.genesis == 0 {
 			header := d.lightchain.CurrentHeader()
 			for header != nil {
@@ -1182,7 +1182,7 @@ func (d *Downloader) fetchReceipts(from uint64) error {
 //  - capacity:    network callback to retrieve the estimated type-specific bandwidth capacity of a peer (traffic shaping)
 //  - idle:        network callback to retrieve the currently (type specific) idle peers that can be assigned tasks
 //  - setIdle:     network callback to set a peer back to idle and update its estimated capacity (traffic shaping)
-//  - kind:        textual label of the type being downloaded to display in log mesages
+//  - kind:        textual label of the type being downloaded to display in log messages
 func (d *Downloader) fetchParts(deliveryCh chan dataPack, deliver func(dataPack) (int, error), wakeCh chan bool,
 	expire func() map[string]int, pending func() int, inFlight func() bool, throttle func() bool, reserve func(*peerConnection, int) (*fetchRequest, bool, error),
 	fetchHook func([]*types.Header), fetch func(*peerConnection, *fetchRequest) error, cancel func(*fetchRequest), capacity func(*peerConnection) int,

eth/downloader/downloader_test.go

@@ -1069,7 +1069,7 @@ func testInvalidHeaderRollback(t *testing.T, protocol int, mode SyncMode) {
 	}
 }
 
-// Tests that a peer advertising an high TD doesn't get to stall the downloader
+// Tests that a peer advertising a high TD doesn't get to stall the downloader
 // afterwards by not sending any useful hashes.
 func TestHighTDStarvationAttack62(t *testing.T)      { testHighTDStarvationAttack(t, 62, FullSync) }
 func TestHighTDStarvationAttack63Full(t *testing.T)  { testHighTDStarvationAttack(t, 63, FullSync) }

eth/downloader/peer.go

@@ -155,7 +155,7 @@ func (p *peerConnection) FetchHeaders(from uint64, count int) error {
 	}
 	p.headerStarted = time.Now()
 
-	// Issue the header retrieval request (absolut upwards without gaps)
+	// Issue the header retrieval request (absolute upwards without gaps)
 	go p.peer.RequestHeadersByNumber(from, count, 0, false)
 
 	return nil