sdl: fix misspellings

Author: malashin

sdl/events.go

@@ -663,7 +663,7 @@ func WaitEventTimeout(timeout int) Event {
 	return goEvent(&cevent)
 }
 
-// WaitEvent swait indefinitely for the next available event.
+// WaitEvent waits indefinitely for the next available event.
 // (https://wiki.libsdl.org/SDL_WaitEvent)
 func WaitEvent() Event {
 	var cevent CEvent

sdl/haptic.go

@@ -277,7 +277,7 @@ func (h *Haptic) NumEffects() (int, error) {
 	return i, errorFromInt(i)
 }
 
-// NumEffectsPlaying reutrns the number of effects a haptic device can play at the same time.
+// NumEffectsPlaying returns the number of effects a haptic device can play at the same time.
 // (https://wiki.libsdl.org/SDL_HapticNumEffectsPlaying)
 func (h *Haptic) NumEffectsPlaying() (int, error) {
 	i := int(C.SDL_HapticNumEffectsPlaying(h.cptr()))

sdl/hints.go

@@ -99,7 +99,7 @@ const (
 // HintCallback is the function to call when the hint value changes.
 type HintCallback func(data interface{}, name, oldValue, newValue string)
 
-// HintCallbackAndData contains a callback function and useradata.
+// HintCallbackAndData contains a callback function and userdata.
 type HintCallbackAndData struct {
 	callback HintCallback // the function to call when the hint value changes
 	data     interface{}  // data to pass to the callback function

sdl/timer_test.go

@@ -7,7 +7,7 @@ import (
 
 // Both time.Sleep() and Delay() are only guaranteed to wait *at least* the
 // given duration, so all tests only check that time differentials are at least
-// a cerain value.
+// a certain value.
 
 func TestGetTicks(t *testing.T) {
 	before := GetTicks()