docs: use valid SCSS variables for example (#21076)

visurel · wagnermaciel · commit df96245dfb42 · 2020-11-18T19:25:15.000-08:00
(cherry picked from commit f62f1cf)
diff --git a/guides/theming-your-components.md b/guides/theming-your-components.md
@@ -22,8 +22,8 @@ For example, if building a custom carousel component:
   // Define any styles affected by the theme.
   .candy-carousel {
     // Use mat-color to extract individual colors from a palette.
-    background-color: mat-color($config);
-    border-color: mat-color($config, A400);
+    background-color: mat-color($primary);
+    border-color: mat-color($accent, A400);
   }
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -22,8 +22,8 @@ For example, if building a custom carousel component:`
`22`	`22`	`// Define any styles affected by the theme.`
`23`	`23`	`.candy-carousel {`
`24`	`24`	`// Use mat-color to extract individual colors from a palette.`
`25`		`- background-color: mat-color($config);`
`26`		`- border-color: mat-color($config, A400);`
	`25`	`+ background-color: mat-color($primary);`
	`26`	`+ border-color: mat-color($accent, A400);`
`27`	`27`	`}`
`28`	`28`	`}`
`29`	`29`	```