Bug overview description.
The links to find out what +privileged, +janitor, etc. mean are broken on this page: https://e621.net/help/show/posts

They link to https://e621.net/help/users, which doesn't exist.

What part(s) of the site page(s) are affected?
Only /help/posts is affected AFAICT.

What is the expected behavior?
It should directly link or redirect to https://e621.net/help/show/accounts

What actual behavior is given instead?
It goes to https://e621.net/help and there is no content.

Time of incident (if applicable).
N/A

Can you reproduce the bug every time?
Yup.

What steps did you take to replicate this bug?
I tried it out in curl.

» % curl -LI https://e621.net/help/users
HTTP/2 301 
date: Wed, 24 May 2017 22:52:05 GMT
content-type: text/html; charset=utf-8
...
status: 301 Moved Permanently
cache-control: no-cache
location: https://e621.net/help/show/users
...

HTTP/2 302 
date: Wed, 24 May 2017 22:52:05 GMT
content-type: text/html; charset=utf-8
...
status: 302 Found
cache-control: no-cache
location: https://e621.net/help
...

HTTP/2 200 
...

Errors or other messages returned (if any).

Error: Help page does not exist

Fixed, thank you for your report!
Special thanks to Ratte and NotMeNotYou for copy/pasta the edited document because I cannot edit e621 namespace wiki pages!