fix redirects for prior version bump (#457)

Author: jeff-allen-mongo

config/redirects

@@ -1,5 +1,5 @@
 define: base https://docs.mongodb.com
-define: versions v2.2 v2.4 v2.6 v3.0 v3.2 v3.4 v3.6 v4.0 v4.2 v4.4 v5.0 v5.1 master
+define: versions v2.2 v2.4 v2.6 v3.0 v3.2 v3.4 v3.6 v4.0 v4.2 v4.4 v5.0 v5.2 master
 symlink: manual -> v5.0
 symlink: upcoming -> v5.0
 symlink: master -> v5.0