docs: add return value in `xy-cell-size` function documentation

diff --git a/scss/xy-grid/_cell.scss b/scss/xy-grid/_cell.scss
index e3360ce790a1df7b630340016a36ffc2989bf60f..07365ca68b254687919c019743c3a95515d88593 100644 (file)
--- a/scss/xy-grid/_cell.scss
+++ b/scss/xy-grid/_cell.scss
@@ -30,6 +30,8 @@
 /// Returns the percentage size of a cell.
 ///
 /// @param {Number|List} $size [$grid-columns] - Size to make the cell. You can pass a value in multiple formats, such as `6`, `50%`, `1 of 2` or `1/3`.
+///
+/// @returns {Number} Size of the cell (in percent).
 @function xy-cell-size(
   $size: $grid-columns
 ) {