ditch .card-blockquote for a regular .blockquote (dependent on #22949)

Author: mdo

docs/4.0/components/card.md

@@ -149,7 +149,7 @@ Card headers can be styled by adding `.card-header` to `<h*>` elements.
     Quote
   </div>
   <div class="card-body">
-    <blockquote class="card-blockquote">
+    <blockquote class="blockquote">
       <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
       <footer>Someone famous in <cite title="Source Title">Source Title</cite></footer>
     </blockquote>
@@ -649,7 +649,7 @@ Cards can be organized into [Masonry](http://masonry.desandro.com)-like columns
     </div>
   </div>
   <div class="card p-3">
-    <blockquote class="card-body card-blockquote">
+    <blockquote class="blockquote card-body">
       <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
       <footer>
         <small class="text-muted">
@@ -667,7 +667,7 @@ Cards can be organized into [Masonry](http://masonry.desandro.com)-like columns
     </div>
   </div>
   <div class="card card-dark card-primary p-3 text-center">
-    <blockquote class="card-blockquote">
+    <blockquote class="blockquote">
       <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat.</p>
       <footer>
         <small>
@@ -687,7 +687,7 @@ Cards can be organized into [Masonry](http://masonry.desandro.com)-like columns
     <img class="card-img" data-src="holder.js/100px260/" alt="Card image">
   </div>
   <div class="card p-3 text-right">
-    <blockquote class="card-blockquote">
+    <blockquote class="blockquote">
       <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
       <footer>
         <small class="text-muted">