Add header anchors to common device page sections.

Change-Id: I5b9a88a3c973a95725095e825db9fa8cb2b342ae
diff --git a/_includes/download.html b/_includes/download.html
index 919f62f..cbcd6b1 100644
--- a/_includes/download.html
+++ b/_includes/download.html
@@ -1,4 +1,4 @@
-<div class='page-heading'>Download Links:</div>
+<div class='page-heading' id='download'>Download Links:</div>
 <hr />
 <p class="text">Current and past versions of TWRP can be found at one of the mirrors below:</p>
 <ul>