Fix label-top-position-* comments

Author: tkrotoff

src/bootstrap-floating-label.scss

@@ -40,22 +40,22 @@
 // |_______________________________|
 //
 //  ____________________________
-// | top: -21px + (21px / 2)    |
+// | top: -21px + (21px / 2.5)  |
 // |_ _ _ _ _ _ _ _ _ _ _ _ _ _ |__
 // |____________________________|  |
 // |                               |
 // |                               |
 // |                               |
 // |_______________________________|
 //
-// top: - label height + (label height / 2)
+// top: - label height + (label height / 2.5)
 //
 $label-height-sm: $font-size-sm * $input-line-height; // 21px
-$label-top-position-sm: #{- $label-height-sm + $label-height-sm / 2.5}; // -21px + (21px / 2) = -10.5px
+$label-top-position-sm: #{- $label-height-sm + $label-height-sm / 2.5}; // -21px + (21px / 2.5) = -12.6px
 $label-height-md: $font-size-base * $input-line-height; // 24px
-$label-top-position-md: #{- $label-height-md + $label-height-md / 2.5}; // -24px + (24px / 2) = -12px
+$label-top-position-md: #{- $label-height-md + $label-height-md / 2.5}; // -24px + (24px / 2.5) = -14.4px
 $label-height-lg: $font-size-lg * $input-line-height; // 30px
-$label-top-position-lg: #{- $label-height-lg + $label-height-lg / 2.5}; // -30px + (30px / 2) = -15px
+$label-top-position-lg: #{- $label-height-lg + $label-height-lg / 2.5}; // -30px + (30px / 2.5) = -18px
 
 @mixin label-common {
   // Breaks flexbox :-/