_carousel.scss: Fix typo in comment (#32950)

Author: Quy

scss/_carousel.scss

@@ -152,7 +152,7 @@
 
 // Optional indicator pips/controls
 //
-// Add an container (such as a list) with the following class and add an item (ideally a focusable control,
+// Add a container (such as a list) with the following class and add an item (ideally a focusable control,
 // like a button) with data-bs-target for each slide your carousel holds.
 
 .carousel-indicators {