Update description of level 0 user limitations

Update description of level 0 user limitations

With the default configuration new users can post 1 image.

diff --git a/docs/ADMIN-QUICK-START-GUIDE.md b/docs/ADMIN-QUICK-START-GUIDE.md
index 96e4610..3b030b1 100644
--- a/docs/ADMIN-QUICK-START-GUIDE.md
+++ b/docs/ADMIN-QUICK-START-GUIDE.md
@@ -82,7 +82,8 @@ Discourse is designed to offer safe defaults for public communities, even with n
 All new users start out in a sandbox with restrictions for everyone's safety. **Trust level 0 (new) users _cannot_** …
 
 - post more than 2 hyperlinks
-- post any images or file attachments
+- post more than 1 image
+- post file attachments
 - send personal messages
 - flag posts or topics
 - have actual links in the "about me" field of their profile

GitHub sha: 3a615a8b

This commit appears in #9740 which was merged by tgxworld.