fix(router): make relativeLinkResolution corrected by default (#25609)

We are changing the default value from 'legacy' to 'corrected' so that new
applications are automatically opted-in to the corrected behavior from #22394.

BREAKING CHANGE: This commit changes the default value of
`relativeLinkResolution` from `'legacy'` to `'default'`. If your
application previously used the default by not specifying a value in the
`ExtraOptions` and uses relative links when navigating from children of
empty path routes, you will need to update your `RouterModule` to
specifically specify `'legacy'` for `relativeLinkResolution`.
See https://angular.io/api/router/ExtraOptions#relativeLinkResolution
for more details.

PR Close #25609

packages/router/src/router.ts

@@ -443,7 +443,7 @@ export class Router {
    * Enables a bug fix that corrects relative link resolution in components with empty paths.
    * @see `RouterModule`
    */
-  relativeLinkResolution: 'legacy'|'corrected' = 'legacy';
+  relativeLinkResolution: 'legacy'|'corrected' = 'corrected';
 
   /**
    * Creates the router service.

packages/router/src/router_module.ts

@@ -425,8 +425,9 @@ export interface ExtraOptions {
    *
    * `<a [routerLink]="['../a']">Link to A</a>`
    *
-   * In other words, you're required to use `../` rather than `./`. This is currently the default
-   * behavior. Setting this option to `corrected` enables the fix.
+   * In other words, you're required to use `../` rather than `./`.
+   *
+   * The default in v11 is `corrected`.
    */
   relativeLinkResolution?: 'legacy'|'corrected';
 }