[unity] Minor cleanup of example scene description, removal of unnecessary lines.

spine-unity/Assets/Spine Examples/Getting Started/4 Object Oriented Sample.unity

@@ -193,7 +193,7 @@ TextMesh:
   m_Text: 'Enter <b>PLAY MODE</b> in Unity to see Spineboy animate.
 
     Try moving, jumping, aiming and shooting. (WASD+Spacebar+Left&Right Click, or
-    XBOX Controller)'
+    Gamepad)'
   m_OffsetZ: 0
   m_CharacterSize: 0.12
   m_LineSpacing: 1

spine-unity/Assets/Spine Examples/Getting Started/5 Basic Platformer.unity

@@ -873,7 +873,7 @@ TextMesh:
   m_GameObject: {fileID: 522034802}
   m_Text: 'Enter <b>PLAY MODE</b> in Unity to see bearded hero guy animate.
 
-    Try moving and jumping. (WASD+Spacebar, or XBOX Controller)'
+    Try moving and jumping. (WASD+Spacebar, or Gamepad)'
   m_OffsetZ: 0
   m_CharacterSize: 0.1
   m_LineSpacing: 1

spine-unity/Assets/Spine Examples/Other Examples/SkeletonUtility Platformer HingeChain Physics.unity

@@ -1421,7 +1421,7 @@ TextMesh:
 
     animated via physics.
 
-    Try moving and jumping. (WASD+Spacebar, or XBOX Controller)'
+    Try moving and jumping. (WASD+Spacebar, or Gamepad)'
   m_OffsetZ: 0
   m_CharacterSize: 0.1
   m_LineSpacing: 1

spine-unity/Assets/Spine Examples/Scripts/Getting Started Scripts/SpineboyBeginnerView.cs

@@ -126,15 +126,13 @@ namespace Spine.Unity.Examples {
 			var shootTrack = skeletonAnimation.AnimationState.SetAnimation(1, shoot, false);
 			shootTrack.AttachmentThreshold = 1f;
 			shootTrack.MixDuration = 0f;
-			var empty1 = skeletonAnimation.state.AddEmptyAnimation(1, 0.5f, 0.1f);
-			empty1.AttachmentThreshold = 1f;
+			skeletonAnimation.state.AddEmptyAnimation(1, 0.5f, 0.1f);
 
 			// Play the aim animation on track 2 to aim at the mouse target.
 			var aimTrack = skeletonAnimation.AnimationState.SetAnimation(2, aim, false);
 			aimTrack.AttachmentThreshold = 1f;
 			aimTrack.MixDuration = 0f;
-			var empty2 = skeletonAnimation.state.AddEmptyAnimation(2, 0.5f, 0.1f);
-			empty2.AttachmentThreshold = 1f;
+			skeletonAnimation.state.AddEmptyAnimation(2, 0.5f, 0.1f);
 
 			gunSource.pitch = GetRandomPitch(gunsoundPitchOffset);
 			gunSource.Play();
@@ -150,8 +148,7 @@ namespace Spine.Unity.Examples {
 		}
 
 		public void StopPlayingAim () {
-			var empty2 = skeletonAnimation.state.AddEmptyAnimation(2, 0.5f, 0.1f);
-			empty2.AttachmentThreshold = 1f;
+			skeletonAnimation.state.AddEmptyAnimation(2, 0.5f, 0.1f);
 		}
 
 		public void Turn (bool facingLeft) {