Add entries from a blog about content discovery in API

Blog url: https://blog.jonlu.ca/posts/experiments-and-growth-hacking

Discovery/Web-Content/common.txt

@@ -598,6 +598,7 @@ analysis
 analytics
 and
 android
+android/config
 announce
 announcement
 announcements
@@ -622,6 +623,8 @@ apanel
 apc
 apexec
 api
+api/experiments
+api/experiments/configurations
 apis
 apl
 apm
@@ -1074,6 +1077,7 @@ clickheat
 clickout
 clicks
 client
+client_configs
 clientaccesspolicy
 clientapi
 clientes
@@ -2227,6 +2231,7 @@ invite
 invoice
 invoices
 ioncube
+ios/config
 ip
 ipc
 ipdata
@@ -4285,7 +4290,9 @@ utility_login
 utils
 v
 v1
+v1/client_configs
 v2
+v2/client_configs
 v3
 v4
 vadmind