fix doc link

Author: nyurik

core/src/fmt/mod.rs

@@ -1108,7 +1108,7 @@ pub fn write(output: &mut dyn Write, args: Arguments<'_>) -> Result {
     if let Some(s) = args.as_str() { output.write_str(s) } else { write_internal(output, args) }
 }
 
-/// Actual implementation of the [`write`], but without the simple string optimization.
+/// Actual implementation of the [`write()`], but without the simple string optimization.
 fn write_internal(output: &mut dyn Write, args: Arguments<'_>) -> Result {
     let mut formatter = Formatter::new(output);
     let mut idx = 0;