extra v6.16 redirects

Author: lindseymoore

config/redirects

@@ -73,8 +73,11 @@ raw: ${prefix}/stable -> ${base}/current/
 [v6.5-master]: ${prefix}/${version}/fundamentals/authentication -> ${base}/security/authentication/
 
 [v6.5-v6.15]: ${prefix}/${version}/fundamentals/authentication/mechanisms/ -> ${base}/security/authentication/mechanisms/
+[v6.16-master]: ${prefix}/${version}/fundamentals/authentication/mechanisms/ -> ${base}/security/authentication/
 
 [v6.5-v6.15]: ${prefix}/${version}/fundamentals/authentication/enterprise-mechanisms/ -> ${base}/security/authentication/enterprise-mechanisms/
+[v6.16-master]: ${prefix}/${version}/fundamentals/authentication/enterprise-mechanisms/ -> ${base}/security/authentication/
+[v6.16-master]: ${prefix}/${version}/security/authentication/enterprise-mechanisms/ -> ${base}/security/authentication
 
 [v6.5-master]: ${prefix}/${version}/fundamentals/encrypt-fields/ -> ${base}/security/encrypt-fields/
 [v6.5-master]: ${prefix}/${version}/fundamentals/connection/tls/ -> ${base}/security/tls/