cleanup the bits headers

src/header/bits_clock-t/mod.rs

@@ -1,5 +1,5 @@
 use crate::platform::types::c_long;
 
-/// Used for system times in clock ticks or CLOCKS_PER_SEC.
+/// Used for system times in clock ticks or `CLOCKS_PER_SEC`.
 #[allow(non_camel_case_types)]
 pub type clock_t = c_long;