Fix typo

Author: LeSeulArtichaut

src/rustbot.md

@@ -14,7 +14,7 @@ comment on the issue at hand:
     @rustbot claim
 
 This will tell `@rustbot` to assign the issue to you if it has no assignee yet.
-Note that because of some GitHub restrictions, you may be assigned indireclty,
+Note that because of some GitHub restrictions, you may be assigned indirectly,
 i.e. `@rustbot` will assign itself as a placeholder and edit the top comment to
 reflect the fact that the issue is now assigned to you.