Remove needless comments in CSSValueKeywords.in

sky/engine/core/css/CSSValueKeywords.in

Index: sky/engine/core/css/CSSValueKeywords.in
diff --git a/sky/engine/core/css/CSSValueKeywords.in b/sky/engine/core/css/CSSValueKeywords.in
index 14750c7ff883941af6d979fbc2649b950978f402..52ae023fd6e6070b326b514088c877a3b621016b 100644
--- a/sky/engine/core/css/CSSValueKeywords.in
+++ b/sky/engine/core/css/CSSValueKeywords.in
@@ -201,6 +201,7 @@ rtl
 visible
 //hidden
 collapse
+
 //
 // Unordered rest
 //
@@ -253,12 +254,6 @@ vertical
 inline-axis
 block-axis
 
-// box-pack
-// start
-// end
-// center
-// justify
-
 // box-lines
 single
 multiple
@@ -271,20 +266,6 @@ space-between
 space-around
 // stretch
 
-// align-items / align-self
-// flex-start
-// flex-end
-// center
-// baseline
-// stretch
-
-// justify-content
-// flex-start
-// flex-end
-// center
-// space-between
-// space-around
-
 // flex-flow
 row
 row-reverse
@@ -411,18 +392,6 @@ visual
 alternate-reverse
 
 //
-// animation-fill-mode
-//
-// forwards
-// backwards
-// both
-
-//
-// animation-iteration-count
-//
-// infinite
-
-//
 // animation-play-state
 //
 running