Rollup merge of rust-lang#57466 - king6cong:comment, r=alexcrichton

Remove outdated comment

More here: rust-lang/rustc-dev-guide#261

Author: Centril

config.toml.example

@@ -288,7 +288,7 @@
 #codegen-units-std = 1
 
 # Whether or not debug assertions are enabled for the compiler and standard
-# library. Also enables compilation of debug! and trace! logging macros.
+# library.
 #debug-assertions = false
 
 # Whether or not debuginfo is emitted