Update Email library documentation example (GH-3720)

A `"` was missing from an `<a href>` tag.
diff --git a/Doc/includes/email-alternative.py b/Doc/includes/email-alternative.py
index 2e142b1..df7ca6f 100644
--- a/Doc/includes/email-alternative.py
+++ b/Doc/includes/email-alternative.py
@@ -32,7 +32,7 @@
   <body>
     <p>Salut!</p>
     <p>Cela ressemble à un excellent
-        <a href="http://www.yummly.com/recipe/Roasted-Asparagus-Epicurious-203718>
+        <a href="http://www.yummly.com/recipe/Roasted-Asparagus-Epicurious-203718">
             recipie
         </a> déjeuner.
     </p>