message: nwnx_visibility.nss typo fix
diff: const int NWNX_VISIBILITY_DEFAULT = -1;
  const int NWNX_VISIBILITY_VISIBLE = 0;
  const int NWNX_VISIBILITY_HIDDEN = 1;
  -const int NWNX_VISIBLITY_DM_ONLY = 2;
  +const int NWNX_VISIBILITY_DM_ONLY = 2;
  // Queries the existing visibility override for given (player, target) pair
  // If player is OBJECT_INVALID, the global visibility override will be returned
  @@ -17,7 +17,7 @@ const int NWNX_VISIBLITY_DM_ONLY = 2;
  // NWNX_VISIBILITY_DEFAULT = Global override not set
  // NWNX_VISIBILITY_VISIBLE = Target is globally visible
  // NWNX_VISIBILITY_HIDDEN = Target is globally hidden
  -// NWNX_VISIBLITY_DM_ONLY = Target is only visible to DMs
  +// NWNX_VISIBILITY_DM_ONLY = Target is only visible to DMs
  int NWNX_Visibility_GetVisibilityOverride(object player, object target);
  // Overrides the default visibility rules about how player perceives the target object
  @@ -32,11 +32,11 @@ int NWNX_Visibility_GetVisibilityOverride(object player, object target);
  // NWNX_VISIBILITY_DEFAULT = Remove the global override
  // NWNX_VISIBILITY_VISIBLE = Target is globally visible
  // NWNX_VISIBILITY_HIDDEN = Target is globally hidden
  -// NWNX_VISIBLITY_DM_ONLY = Target is only visible to DMs
  +// NWNX_VISIBILITY_DM_ONLY = Target is only visible to DMs
  //
  // Note:
  // Player state overrides the global state which means if a global state is set
  -// to NWNX_VISIBILITY_HIDDEN or NWNX_VISIBLITY_DM_ONLY but the player's state is
  +// to NWNX_VISIBILITY_HIDDEN or NWNX_VISIBILITY_DM_ONLY but the player's state is
  // set to NWNX_VISIBILITY_VISIBLE for the target, the object will be visible to the player
  void NWNX_Visibility_SetVisibilityOverride(object player, object target, int override);
  