Added extends directive to all customization examples

docs/reference/meta-tags.md

@@ -113,6 +113,8 @@ In order to add custom `meta` tags to your document, you can [extend the theme
 policies for search engines:
 
 ``` html
+{% extends "base.html" %}
+
 {% block extrahead %}
   <meta property="robots" content="noindex, nofollow" />
 {% endblock %}
@@ -127,6 +129,8 @@ values for different pages, you can use the `page.meta` object inside your
 template override, e.g.:
 
 ``` html
+{% extends "base.html" %}
+
 {% block extrahead %}
   {% if page and page.meta and page.meta.robots %}
     <meta property="robots" content="{{ page.meta.robots }}" />

docs/setup/adding-a-comment-system.md

@@ -77,6 +77,8 @@ In order to integrate another JavaScript-based comment system provider, you can
 [extend the theme][7] and [override the `disqus` block][8]:
 
 ``` html
+{% extends "base.html" %}
+
 {% block disqus %}
   <!-- Add custom comment system integration here -->
 {% endblock %}

docs/setup/setting-up-site-search.md

@@ -312,6 +312,8 @@ customize the `transform` function, you can do this by [overriding the
 `config` block][24]:
 
 ``` html
+{% extends "base.html" %}
+
 {% block config %}
   {{ super() }}
   <script>

docs/setup/setting-up-the-header.md

@@ -42,6 +42,8 @@ an announcement bar, [extend the theme][4] and [override the `announce`
 block][5], which is empty by default:
 
 ``` html
+{% extends "base.html" %}
+
 {% block announce %}
   <!-- Add your announcement here, including arbitrary HTML -->
 {% endblock %}

docs/setup/setting-up-versioning.md

@@ -76,6 +76,8 @@ visits any other version than the latest version. Using [theme extension][8],
 you can [define the `outdated` block][9]:
 
 ``` html
+{% extends "base.html" %}
+
 {% block outdated %}
   You're not viewing the latest version.
   <a href="{{ '../' ~ base_url }}"> <!-- (1) -->