docs: Use pkg.go.dev instead of godoc.org (Go files)

examples/blur/main.go

@@ -53,7 +53,7 @@ func update(screen *ebiten.Image) error {
 			// Alpha scale should be 1.0/49.0, but accumulating 1/49 49 times doesn't reach to 1, because
 			// the final color is affected by the destination alpha when CompositeModeSourceOver is used.
 			// This composite mode is the default mode. See how this is calculated at the doc:
-			// https://godoc.org/github.com/hajimehoshi/ebiten#CompositeMode
+			// https://pkg.go.dev/github.com/hajimehoshi/ebiten#CompositeMode
 			//
 			// Use a higher value than 1.0/49.0. Here, 1.0/25.0 here to get a reasonable result.
 			op.ColorM.Scale(1, 1, 1, 1.0/25.0)

examples/sprites/main.go

@@ -182,7 +182,7 @@ func update(screen *ebiten.Image) error {
 	// the actual draw call to GPU is very few since these calls satisfy
 	// some conditions e.g. all the rendering sources and targets are same.
 	// For more detail, see:
-	// https://godoc.org/github.com/hajimehoshi/ebiten#Image.DrawImage
+	// https://pkg.go.dev/github.com/hajimehoshi/ebiten#Image.DrawImage
 	w, h := ebitenImage.Size()
 	for i := 0; i < sprites.num; i++ {
 		s := sprites.sprites[i]

examples/spriteshd/main.go

@@ -168,7 +168,7 @@ func update(screen *ebiten.Image) error {
 	// the actual draw call to GPU is very few since these calls satisfy
 	// some conditions e.g. all the rendering sources and targets are same.
 	// For more detail, see:
-	// https://godoc.org/github.com/hajimehoshi/ebiten#Image.DrawImage
+	// https://pkg.go.dev/github.com/hajimehoshi/ebiten#Image.DrawImage
 	w, h := ebitenImage.Size()
 	for i := 0; i < sprites.num; i++ {
 		s := sprites.sprites[i]

examples/tiles/main.go

@@ -110,7 +110,7 @@ func update(screen *ebiten.Image) error {
 	// Draw each tile with each DrawImage call.
 	// As the source images of all DrawImage calls are always same,
 	// this rendering is done very effectively.
-	// For more detail, see https://godoc.org/github.com/hajimehoshi/ebiten#Image.DrawImage
+	// For more detail, see https://pkg.go.dev/github.com/hajimehoshi/ebiten#Image.DrawImage
 	const xNum = screenWidth / tileSize
 	for _, l := range layers {
 		for i, t := range l {