chore: fix some comments (#2191)

Author: VitalikButerinEth

blockchain/chainio_test.go

@@ -23,7 +23,7 @@ func TestErrNotInMainChain(t *testing.T) {
 
 	// Ensure the stringized output for the error is as expected.
 	if err.Error() != errStr {
-		t.Fatalf("errNotInMainChain retuned unexpected error string - "+
+		t.Fatalf("errNotInMainChain returned unexpected error string - "+
 			"got %q, want %q", err.Error(), errStr)
 	}
 

blockchain/indexers/addrindex.go

@@ -36,7 +36,7 @@ const (
 	// consumes.  It consists of the address key + 1 byte for the level.
 	levelKeySize = addrKeySize + 1
 
-	// levelOffset is the offset in the level key which identifes the level.
+	// levelOffset is the offset in the level key which identifies the level.
 	levelOffset = levelKeySize - 1
 
 	// addrKeyTypePubKeyHash is the address type in an address key which

config.go

@@ -244,7 +244,7 @@ func supportedSubsystems() []string {
 // the levels accordingly.  An appropriate error is returned if anything is
 // invalid.
 func parseAndSetDebugLevels(debugLevel string) error {
-	// When the specified string doesn't have any delimters, treat it as
+	// When the specified string doesn't have any delimiters, treat it as
 	// the log level for all subsystems.
 	if !strings.Contains(debugLevel, ",") && !strings.Contains(debugLevel, "=") {
 		// Validate debug log level.