portico: Fix title and description for /attribution.

templates/corporate/attribution.html

@@ -2,9 +2,12 @@
 {% set entrypoint = "landing-page" %}
 
 {% block title %}
-<title>Zulip: The best group chat for your business.</title>
+<title>Zulip attributions</title>
 {% endblock %}
 
+{% set OPEN_GRAPH_TITLE = 'Zulip website attributions' %}
+{% set OPEN_GRAPH_DESCRIPTION = '' %}
+
 {% block customhead %}
 <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 {% endblock %}
@@ -17,7 +20,7 @@
     <div class="hero empty-hero"></div>
     <div class="main">
         <div class="padded-content">
-            <h1>Attributions</h1>
+            <h1>Website attributions</h1>
             <ul>
                 <li>
                     <b>On <a href="/for/business">/for/business</a> page:</b>

zerver/tests/test_docs.py

@@ -174,7 +174,7 @@ class DocPageTest(ZulipTestCase):
         self._test("/for/communities/", "Zulip for communities")
         self._test("/self-hosting/", "Self-host Zulip")
         self._test("/security/", "TLS encryption")
-        self._test("/attribution/", "Attributions")
+        self._test("/attribution/", "Website attributions")
         self._test("/devlogin/", "Normal users", landing_page=False)
         self._test("/devtools/", "Useful development URLs")
         self._test("/errors/404/", "Page not found")