eth/downloader: minor typo fixes in comments (#21035)

eth/downloader/downloader.go

@@ -361,7 +361,7 @@ func (d *Downloader) synchronise(id string, hash common.Hash, td *big.Int, mode
 		log.Info("Block synchronisation started")
 	}
 	// If we are already full syncing, but have a fast-sync bloom filter laying
-	// around, make sure it does't use memory any more. This is a special case
+	// around, make sure it doesn't use memory any more. This is a special case
 	// when the user attempts to fast sync a new empty network.
 	if mode == FullSync && d.stateBloom != nil {
 		d.stateBloom.Close()
@@ -665,7 +665,7 @@ func calculateRequestSpan(remoteHeight, localHeight uint64) (int64, int, int, ui
 		requestHead = 0
 	}
 	// requestBottom is the lowest block we want included in the query
-	// Ideally, we want to include just below own head
+	// Ideally, we want to include the one just below our own head
 	requestBottom := int(localHeight - 1)
 	if requestBottom < 0 {
 		requestBottom = 0

eth/downloader/downloader_test.go

@@ -1126,7 +1126,7 @@ func testBlockHeaderAttackerDropping(t *testing.T, protocol int) {
 	chain := testChainBase.shorten(1)
 
 	for i, tt := range tests {
-		// Register a new peer and ensure it's presence
+		// Register a new peer and ensure its presence
 		id := fmt.Sprintf("test %d", i)
 		if err := tester.newPeer(id, protocol, chain); err != nil {
 			t.Fatalf("test %d: failed to register new peer: %v", i, err)

eth/downloader/queue.go

@@ -234,8 +234,7 @@ func (q *queue) ShouldThrottleReceipts() bool {
 }
 
 // resultSlots calculates the number of results slots available for requests
-// whilst adhering to both the item and the memory limit too of the results
+// whilst adhering to both the item and the memory limits of the result cache.
-// cache.
 func (q *queue) resultSlots(pendPool map[string]*fetchRequest, donePool map[common.Hash]struct{}) int {
 	// Calculate the maximum length capped by the memory limit
 	limit := len(q.resultCache)
@@ -348,7 +347,7 @@ func (q *queue) Schedule(headers []*types.Header, from uint64) []*types.Header {
 }
 
 // Results retrieves and permanently removes a batch of fetch results from
-// the cache. the result slice will be empty if the queue has been closed.
+// the cache. The result slice will be empty if the queue has been closed.
 func (q *queue) Results(block bool) []*fetchResult {
 	q.lock.Lock()
 	defer q.lock.Unlock()

trie/sync.go

@@ -174,8 +174,8 @@ func (s *Sync) Missing(max int) []common.Hash {
 }
 
 // Process injects a batch of retrieved trie nodes data, returning if something
-// was committed to the database and also the index of an entry if processing of
+// was committed to the database and also the index of an entry if its processing
-// it failed.
+// failed.
 func (s *Sync) Process(results []SyncResult) (bool, int, error) {
 	committed := false