Updated nested blockquote test case to proper markdown syntax

test/cases/nested-blockquote.html

@@ -2,7 +2,7 @@
 	<p>This is a multi line blockquote test</p>
 
     <blockquote>
-        <p>And nesting!
+        <p>And nesting!</p>
     </blockquote>
 
 	<p>With more than one line.</p>

test/cases/nested-blockquote.md

@@ -1,4 +1,6 @@
 
   > This is a multi line blockquote test
+  >
   > > And nesting!
+  >
   > With more than one line.