Fixed typos in header file documentation comments.

include/SDL_haptic.h

@@ -900,7 +900,7 @@ extern DECLSPEC int SDLCALL SDL_JoystickIsHaptic(SDL_Joystick * joystick);
 /**
  *  \brief Opens a Haptic device for usage from a Joystick device.
  *
- *  You must still close the haptic device seperately.  It will not be closed
+ *  You must still close the haptic device separately.  It will not be closed
  *  with the joystick.
  *
  *  When opening from a joystick you should first close the haptic device before
@@ -957,7 +957,7 @@ extern DECLSPEC int SDLCALL SDL_HapticNumEffects(SDL_Haptic * haptic);
 extern DECLSPEC int SDLCALL SDL_HapticNumEffectsPlaying(SDL_Haptic * haptic);
 
 /**
- *  \brief Gets the haptic devices supported features in bitwise matter.
+ *  \brief Gets the haptic device's supported features in bitwise manner.
  *
  *  Example:
  *  \code