Fix PDF link override

Author: nseidle

docs/overrides/main.html

@@ -2,7 +2,7 @@
 
 {% block content %}
 {% if true %}
-    <a href="https://github.com/sparkfun/SparkFun_RTK_Firmware/blob/gh-pages/pdf/SparkFun_RTK_User_Manual.pdf?raw=true" title="Download Site" class="md-content__button md-icon">
+    <a href="https://github.com/sparkfun/SparkFun_RTK_Everywhere_Firmware/blob/gh-pages/pdf/SparkFun_RTK_Everywhere_User_Manual.pdf?raw=true" title="Download Site" class="md-content__button md-icon">
         {% include ".icons/material/file-pdf-box.svg" %}
     </a>
 {% endif %}