add 'driver' role to v4.2 docs (#1477)

Author: jeff-allen-mongo

conf.py

@@ -96,7 +96,8 @@ def has(self, *args):
     'api': ('https://www.mongodb.com/docs/drivers/%s', ''),
     'gettingstarted': ('https://www.mongodb.com/docs/getting-started%s', ''),
     'manual': ('https://www.mongodb.com/docs/manual%s', ''),
-    'ecosystem': ('https://www.mongodb.com/docs/ecosystem%s', ''),
+    'ecosystem': ('https://www.mongodb.com/docs/drivers%s', ''),
+    'driver': ('https://www.mongodb.com/docs/drivers%s', ''),
     'mms-docs': ('https://www.mongodb.com/docs/cloud-manager%s', ''),
     'mms-home': ('https://www.mongodb.com/cloud/cloud-manager%s', ''),
     'opsmgr': ('https://www.mongodb.com/docs/ops-manager/current%s', ''),