docs(common): migrate @howToUse tags (#23062)

In pipes the content of these tags is now generated automatically.
In directives these tags have been converted to `@usageNotes` tags,
but in the future me might find a way to generate that usage too.

PR Close #23062

packages/common/src/directives/ng_template_outlet.ts

@@ -13,7 +13,7 @@ import {Directive, EmbeddedViewRef, Input, OnChanges, SimpleChange, SimpleChange
  *
  * @whatItDoes Inserts an embedded view from a prepared `TemplateRef`
  *
- * @howToUse
+ * @usageNotes
  * ```
  * <ng-container *ngTemplateOutlet="templateRefExp; context: contextExp"></ng-container>
  * ```