Documentation link always points to latest version
This is confusing. I've had users click "Documentation" and complain to me that functions don't work, only to find out they're newly committed functions that haven't made into a release yet.

It should point to the version that is running.
diff --git a/webapp/graphite/settings.py b/webapp/graphite/settings.py
index 700d5085..17d621f4 100644
--- a/webapp/graphite/settings.py
+++ b/webapp/graphite/settings.py
@@ -113,7 +113,8 @@ REMOTE_RENDER_CONNECT_TIMEOUT = 1.0
 
 #Miscellaneous settings
 SMTP_SERVER = "localhost"
-DOCUMENTATION_URL = "http://graphite.readthedocs.io/"
+DOCUMENTATION_VERSION = 'latest' if 'dev' in WEBAPP_VERSION else WEBAPP_VERSION
+DOCUMENTATION_URL = 'https://graphite.readthedocs.io/en/{}/'.format(DOCUMENTATION_VERSION)
 ALLOW_ANONYMOUS_CLI = True
 LEGEND_MAX_ITEMS = 10
 RRD_CF = 'AVERAGE'
['webapp/graphite/settings.py']