docs(overlay): Drop extra the in a comment (#17341)

Author: NothingEverHappens

src/cdk/overlay/overlay.ts

@@ -29,7 +29,7 @@ import {ScrollStrategyOptions} from './scroll/index';
 /** Next overlay unique ID. */
 let nextUniqueId = 0;
 
-// Note that Overlay is *not* scoped to the app root because the of the ComponentFactoryResolver
+// Note that Overlay is *not* scoped to the app root because of the ComponentFactoryResolver
 // which needs to be different depending on where OverlayModule is imported.
 
 /**