crater no wait

Author: KodrAus

src/tools-and-bots/crater.md

@@ -4,14 +4,20 @@
 
 [Crater](https://github.com/rust-lang/crater) is a tool that can test PRs against a public subset of the Rust ecosystem to estimate the scale of potential breakage.
 
-You can kick off a crater run with:
+You can kick off a crater run by first calling:
 
 ```
-@bors try @craterbot check
+@bors try
+```
+
+Once that finishes, you can then call:
+
+```
+@craterbot check
 ```
 
 to ensure crates compile, or:
 
 ```
-@bors try @craterbot run mode=build-and-test
+@craterbot run mode=build-and-test
 ```