Update products.html

Author: kimsanghoon1

_layouts/products.html

@@ -12,7 +12,7 @@
                 <div class="col-md-6">
                     <h1 class="intro-title text-uppercase white-text mb-30">{{ page.title }}</h1>
                     <p class="lead text-regular white-text">{{ page.intro }}</p>
-                    {% if page.guide %}
+                    {% if page.docs %}
                     <a href="{{ page.docs }}" class="btn btn-lg blue waves-effect waves-light mt-30">Docs</a>
                     {% endif %}