docs(Grid): Fix missing sassdocs @param

Closes #5432

projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss

@@ -73,6 +73,8 @@
 /// @param {Color} $body-summaries-text-color [null] - The text color of the summary results located the body.
 /// @param {Color} $root-summaries-background [null] - The background color of the summary groups located the footer.
 /// @param {Color} $root-summaries-text-color [null] - The text color of the summary results located the footer.
+/// @param {Color} sortable-header-icon-hover-color [null] - The icon color on hover in grid header when the column is sortable.
+
 /// @param {box-shadow} $grid-shadow [null] - The shadow of the grid.
 /// @param {box-shadow} $drag-shadow [null] - The shadow used for movable elements (ex. column headers).
 /// @param {color} $row-drag-color [null] - The row drag handle color.
@@ -175,6 +177,7 @@
     $row-ghost-background: null,
     $row-drag-color: null,
     $drop-area-border-radius: null,
+    $sortable-header-icon-hover-color: null
 ) {
     $name: 'igx-grid';
     $grid-schema: map-get($schema, $name);
@@ -453,7 +456,8 @@
         drag-shadow: $drag-shadow,
         row-ghost-background: $row-ghost-background,
         row-drag-color: $row-drag-color,
-        drop-area-border-radius: $drop-area-border-radius
+        drop-area-border-radius: $drop-area-border-radius,
+        sortable-header-icon-hover-color: $sortable-header-icon-hover-color
     ));
 }