Remove smoke/slate references in button examples

Author: adamwathan

docs/source/docs/examples/buttons.blade.md

@@ -81,7 +81,7 @@ description: null
 ### Elevated
 
 @component('_partials.code-sample', ['lang' => 'html', 'class' => 'text-center'])
-<button class="bg-white hover:bg-smoke-lighter text-slate-dark font-semibold py-2 px-4 border border-slate-lighter rounded shadow">
+<button class="bg-white hover:bg-grey-lightest text-grey-darkest font-semibold py-2 px-4 border border-grey-light rounded shadow">
   Button
 </button>
 @endcomponent
@@ -90,10 +90,10 @@ description: null
 
 @component('_partials.code-sample', ['lang' => 'html', 'class' => 'text-center'])
 <div class="inline-flex">
-  <button class="bg-smoke hover:bg-smoke-dark text-slate-dark font-bold py-2 px-4 rounded-l">
+  <button class="bg-grey-light hover:bg-grey text-grey-darkest font-bold py-2 px-4 rounded-l">
     Prev
   </button>
-  <button class="bg-smoke hover:bg-smoke-dark text-slate-dark font-bold py-2 px-4 rounded-r">
+  <button class="bg-grey-light hover:bg-grey text-grey-darkest font-bold py-2 px-4 rounded-r">
     Next
   </button>
 </div>
@@ -102,7 +102,7 @@ description: null
 ### Icons
 
 @component('_partials.code-sample', ['lang' => 'html', 'class' => 'text-center'])
-<button class="bg-smoke hover:bg-smoke-dark text-slate-dark font-bold py-2 px-4 rounded inline-flex items-center">
+<button class="bg-grey-light hover:bg-grey text-grey-darkest font-bold py-2 px-4 rounded inline-flex items-center">
   <svg class="w-4 h-4 mr-2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"><path d="M13 8V2H7v6H2l8 8 8-8h-5zM0 18h20v2H0v-2z"/></svg>
   <span>Download</span>
 </button>