Changed font for Installation Page relative link

Font for the "Continue to Installation page" relative
link has been changed to header 3.

Signed-off-by: Robert Wolff <robert.wolff@linaro.org>

Author: Robert Wolff

ConsumerEdition/HiKey/Downloads/AOSP.md

@@ -27,4 +27,4 @@ Not Available...
 |userdata.img.tar.xz      |[4G](http://builds.96boards.org/releases/hikey/linaro/aosp/latest/userdata-4gb.img.tar.xz) / [8G](http://builds.96boards.org/releases/hikey/linaro/aosp/latest/userdata-8gb.img.tar.xz)            |
 |cache.img.tar.xz         |[Download](http://builds.96boards.org/releases/hikey/linaro/aosp/latest/cache.img.tar.xz)            |
 
-Continue to [Installation page](../Installation/README.md)
+### Continue to [Installation page](../Installation/README.md)