fix(carousel): wording

Author: adrianptrv

src/app/layouts/carousel/carousel-styling-sample/carousel-styling-sample.component.scss

@@ -1,8 +1,8 @@
 @use "layout.scss";
 @use "igniteui-angular/theming" as *;
 
-// Create carousel panel theme
-$custom-panel-theme: carousel-theme(
+// Create a carousel theme.
+$custom-carousel-theme: carousel-theme(
   $button-background: rgb(124 50 221 / 60%),
   $button-arrow-color: #c5bcd0,
   $button-hover-arrow-color: #F3E8FF,
@@ -11,5 +11,5 @@ $custom-panel-theme: carousel-theme(
   $button-shadow: var(--ig-elevation-5)
 );
 
-// Apply the custom themes to the components mixins.
-@include css-vars($custom-panel-theme); 
+// Apply the custom theme.
+@include css-vars($custom-carousel-theme);