Please link the full rust-timer commands from the help page

[scottmcm]

https://perf.rust-lang.org/help.html says

@rust-timer has more commands than just @rust-timer queue, but the queue command is the most used.

It took me more time than I care to admit to find

rustc-perf/site/src/request_handlers/github.rs

Line 12 in b3b52c5

lazy_static::lazy_static! {

to know what those other ones are. A link -- just to the code, if there aren't docs -- would be handy from the site.