docs: consistent spacing in tutorial html files (#23105) (#24497)

- Removed surrounding spaces in interpolation expressions following the styleguide
- Consistant spacing of two spaces in html

Fixes #23105

PR Close #24497

aio/content/examples/toh-pt1/src/app/heroes/heroes.component.1.html

@@ -3,15 +3,15 @@
 <!-- #enddocregion show-hero-1 -->
 
 <!-- #docregion show-hero-2 -->
-<h2>{{ hero.name }} Details</h2>
+<h2>{{hero.name}} Details</h2>
 <div><span>id: </span>{{hero.id}}</div>
 <div><span>name: </span>{{hero.name}}</div>
 <!-- #enddocregion show-hero-2 -->
 
 <!-- #docregion name-input -->
 <div>
-    <label>name:
-      <input [(ngModel)]="hero.name" placeholder="name">
-    </label>
+  <label>name:
+    <input [(ngModel)]="hero.name" placeholder="name">
+  </label>
 </div>
 <!-- #enddocregion name-input -->

aio/content/examples/toh-pt1/src/app/heroes/heroes.component.html

@@ -1,10 +1,10 @@
 <!-- #docregion -->
 <!-- #docregion pipe -->
-<h2>{{ hero.name | uppercase }} Details</h2>
+<h2>{{hero.name | uppercase}} Details</h2>
 <!-- #enddocregion pipe -->
 <div><span>id: </span>{{hero.id}}</div>
 <div>
-    <label>name:
-      <input [(ngModel)]="hero.name" placeholder="name">
-    </label>
+  <label>name:
+    <input [(ngModel)]="hero.name" placeholder="name">
+  </label>
 </div>

aio/content/examples/toh-pt2/src/app/heroes/heroes.component.html

@@ -14,7 +14,7 @@
 <div *ngIf="selectedHero">
 
   <!-- #docregion selectedHero-details -->
-  <h2>{{ selectedHero.name | uppercase }} Details</h2>
+  <h2>{{selectedHero.name | uppercase}} Details</h2>
   <div><span>id: </span>{{selectedHero.id}}</div>
   <div>
     <label>name:

aio/content/examples/toh-pt3/src/app/hero-detail/hero-detail.component.html

@@ -1,6 +1,6 @@
 <div *ngIf="hero">
 
-  <h2>{{ hero.name | uppercase }} Details</h2>
+  <h2>{{hero.name | uppercase}} Details</h2>
   <div><span>id: </span>{{hero.id}}</div>
   <div>
     <label>name:

aio/content/examples/toh-pt4/src/app/hero-detail/hero-detail.component.html

@@ -1,5 +1,5 @@
 <div *ngIf="hero">
-  <h2>{{ hero.name | uppercase }} Details</h2>
+  <h2>{{hero.name | uppercase}} Details</h2>
   <div><span>id: </span>{{hero.id}}</div>
   <div>
     <label>name:

aio/content/examples/toh-pt5/src/app/hero-detail/hero-detail.component.html

@@ -1,5 +1,5 @@
 <div *ngIf="hero">
-  <h2>{{ hero.name | uppercase }} Details</h2>
+  <h2>{{hero.name | uppercase}} Details</h2>
   <div><span>id: </span>{{hero.id}}</div>
   <div>
     <label>name:

aio/content/examples/toh-pt6/src/app/hero-detail/hero-detail.component.html

@@ -1,5 +1,5 @@
 <div *ngIf="hero">
-  <h2>{{ hero.name | uppercase }} Details</h2>
+  <h2>{{hero.name | uppercase}} Details</h2>
   <div><span>id: </span>{{hero.id}}</div>
   <div>
     <label>name:

aio/content/examples/toh-pt6/src/app/heroes/heroes.component.html

@@ -20,7 +20,7 @@
     </a>
     <!-- #docregion delete -->
     <button class="delete" title="delete hero"
-    (click)="delete(hero)">x</button>
+      (click)="delete(hero)">x</button>
     <!-- #enddocregion delete -->
   </li>
 </ul>