Added missing extends pragmas

Author: squidfunk

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

@@ -526,6 +526,8 @@ search to an external service, you can add a custom JavaScript file to the
 `docs` directory and [override the `config` block][overriding blocks]:
 
 ``` html
+{% extends "base.html" %}
+
 {% block config %}
   {{ super() }}
   <script>

docs/setup/setting-up-social-cards.md

@@ -225,6 +225,8 @@ you don't want to use it:
 === ":material-graph: Open Graph"
 
     ``` html
+    {% extends "base.html" %}
+
     {% block extrahead %}
       {% set title = config.site_name %}
       {% if page and page.meta and page.meta.title %}
@@ -246,6 +248,8 @@ you don't want to use it:
 === ":fontawesome-brands-twitter: Twitter Cards"
 
     ``` html
+    {% extends "base.html" %}
+
     {% block extrahead %}
       {% set title = config.site_name %}
       {% if page and page.meta and page.meta.title %}