docs: fix minor typo on comment (#15002)

extract individual colors a palette -> extract individual colors from a palette.

Author: ahasall

guides/theming-your-components.md

@@ -19,7 +19,7 @@ For example, if building a custom carousel component:
 
   // Define any styles affected by the theme.
   .candy-carousel {
-    // Use mat-color to extract individual colors a palette.
+    // Use mat-color to extract individual colors from a palette.
     background-color: mat-color($primary);
     border-color: mat-color($accent, A400);
   }