docs: Updated button width in documentation/reactivity (#8897)

* Updated button width in documentation/reactivity

Fixed button width in order to avoid the changing width of the button in the result when the text changes from 'time' to 'times'

* Made style changes as per the guidelines

* Replicated changes made in app-a to app-b

* Update App.svelte

* Update App.svelte

---------

Co-authored-by: Puru Vijay <47742487+PuruVJ@users.noreply.github.com>

documentation/tutorial/02-reactivity/01-reactive-assignments/app-a/App.svelte

@@ -10,3 +10,9 @@
 	Clicked {count}
 	{count === 1 ? 'time' : 'times'}
 </button>
+
+<style>
+	button {
+		width:200px;
+	}
+</style>

documentation/tutorial/02-reactivity/01-reactive-assignments/app-b/App.svelte

@@ -10,3 +10,9 @@
 	Clicked {count}
 	{count === 1 ? 'time' : 'times'}
 </button>
+
+<style>
+	button {
+		width:200px;
+	}
+</style>