Don't use a footnote

Author: joshtriplett

content/inside-rust/call-for-testing-hint-mostly-unused.md

@@ -15,15 +15,13 @@ future.
 ## Background
 
 When building a Rust library crate, the compiler generates compiled code for as
-much of the crate as it can[^1], which
-gets linked into later crates into the dependency graph. However, some crates
-provide comprehensive APIs with a very large surface area, yet many of their
-users need only a few entry points. In such cases, the compiler currently
+much of the crate as it can (everything that isn't generic and isn't inlined),
+which gets linked into later crates into the dependency graph. However, some
+crates provide comprehensive APIs with a very large surface area, yet many of
+their users need only a few entry points. In such cases, the compiler currently
 spends time generating code for the entire crate, and the linker then ends up
 throwing most of that code away as unused.
 
-[^1]: Roughly, everything that isn't generic and isn't inlined.
-
 This can waste a substantial amount of compile time. Some large crates can take
 minutes to compile, and when you use these large crates as dependencies, they
 can take a disproportionate amount of the entire compilation time of your