fix(NumberPicker): corner config

Author: bindoon

src/number-picker/scss/variable.scss

@@ -40,8 +40,8 @@ $number-picker-inline-m-button-icon-size: $icon-xs !default;
 /// @type number
 /// @namespace size/button
 $number-picker-inline-m-button-margin: 2px !default;
-// corner
-// @namespace size/button
+/// corner
+/// @namespace size/button
 $number-picker-inline-m-button-corner: $corner-1 !default;
 /// icon
 /// @namespace size/button
@@ -50,6 +50,6 @@ $number-picker-inline-l-button-icon-size: $icon-xs !default;
 /// @type number
 /// @namespace size/button
 $number-picker-inline-l-button-margin: 2px !default;
-// corner
-// @namespace size/button
+/// corner
+/// @namespace size/button
 $number-picker-inline-l-button-corner: $corner-1 !default;