all: Run modernize -fix ./...

markup/tableofcontents/tableofcontents.go

@@ -250,7 +250,7 @@ func (b *tocBuilder) writeHeading(level, indent int, h *Heading) {
 }
 
 func (b *tocBuilder) indent(n int) {
-	for i := 0; i < n; i++ {
+	for range n {
 		b.s.WriteString("  ")
 	}
 }

markup/tableofcontents/tableofcontents_test.go

@@ -196,7 +196,7 @@ func TestTocMisc(t *testing.T) {
 func BenchmarkToc(b *testing.B) {
 	newTocs := func(n int) []*Fragments {
 		var tocs []*Fragments
-		for i := 0; i < n; i++ {
+		for range n {
 			tocs = append(tocs, newTestToc())
 		}
 		return tocs