refactor(aria/toolbar): update basic horizontal toolbar aria-label (angular#32125)

Updates basic horizontal toolbar aria-label to be more specific
to communicate to the user that it is the horizontal text
formatting toolbar.

Author: essjay05

src/components-examples/aria/toolbar/toolbar-basic-horizontal/toolbar-basic-horizontal-example.html

@@ -1,5 +1,5 @@
 <div class="example-container">
-    <div ngToolbar class="example-toolbar" aria-label="Text Formatting Tools">
+    <div ngToolbar class="example-toolbar" aria-label="Horizontal Toolbar Text Formatting Tools">
         <button
             ngToolbarWidget
             class="example-radio-button"