Remove a hchk.io reference from docs.

hc/front/views.py

@@ -213,6 +213,7 @@ def docs(request):
         "section": "home",
         "ping_endpoint": settings.PING_ENDPOINT,
         "ping_email": "your-uuid-here@%s" % settings.PING_EMAIL_DOMAIN,
+        "ping_email_domain": settings.PING_EMAIL_DOMAIN,
         "ping_url": settings.PING_ENDPOINT + "your-uuid-here"
     }
 

templates/front/docs.html

@@ -273,9 +273,9 @@ using the "-command" argument:</p>
 </p>
 <p>
     The solution: set up another check, and add its
-    @hchk.io address to your list of recipient email addresses. Set its
-    Period to 1 week. As long as your weekly email script runs correctly,
-    the check will be regularly pinged and will stay up.
+    @{{ ping_email_domain }} address to your list of recipient email addresses.
+    Set its Period to 1 week. As long as your weekly email script runs
+    correctly, the check will be regularly pinged and will stay up.
 </p>