docs: fix incorrect line highlighting in tutorials

Ensures highlighted lines in tutorial examples match the
corresponding code shown to readers.

Author: MeAkib

adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/README.md

@@ -31,7 +31,7 @@ import { NgOptimizedImage } from '@angular/common';
 
 To enable the `NgOptimizedImage` directive, swap out the `src` attribute for `ngSrc`. This applies for both static image sources (i.e., `src`) and dynamic image sources (i.e., `[src]`).
 
-```angular-ts {highlight:[[9],[13]]}
+```angular-ts {highlight:[[7],[11]]}
 import { NgOptimizedImage } from '@angular/common';
 
 @Component({

adev/src/content/tutorials/learn-angular/steps/15-forms/README.md

@@ -31,7 +31,7 @@ For this form to use Angular features that enable data binding to forms, you'll
 
 Import the `FormsModule` from `@angular/forms` and add it to the `imports` array of the `User`.
 
-```ts {highlight:[2,7]}
+```ts {highlight:[2,6]}
 import {Component} from '@angular/core';
 import {FormsModule} from '@angular/forms';