docs: fix the broken housing location template in the first-app tutorial

Step 11 of the first-app tutorial ships a `housing-location.ts` whose heading
reads `{{ housingLocatio()).name }}`, a misspelled property followed by an
extra parenthesis, so the step's source fails to compile with a template
parser error. Step 10 reuses this directory as its answer.

It came in with #61686, which migrated the tutorial to signal inputs. Use
`housingLocation().name`, matching the rest of the template and every other
step.

adev/src/content/tutorials/first-app/steps/11-details-page/src/app/housing-location/housing-location.ts

@@ -13,7 +13,7 @@ import {RouterLink} from '@angular/router';
         alt="Exterior photo of {{ housingLocation().name }}"
         crossorigin
       />
-      <h2 class="listing-heading">{{ housingLocatio()).name }}</h2>
+      <h2 class="listing-heading">{{ housingLocation().name }}</h2>
       <p class="listing-location">{{ housingLocation().city }}, {{ housingLocation().state }}</p>
     </section>
   `,