Touch up PR 1737

Author: dtolnay

src/file.rs

@@ -15,7 +15,7 @@ ast_struct! {
     ///
     /// ```
     /// use std::env;
-    /// use std::fs::read_to_string;
+    /// use std::fs;
     /// use std::process;
     ///
     /// fn main() {
@@ -33,7 +33,7 @@ ast_struct! {
     ///         }
     ///     };
     ///
-    ///     let src = read_to_string(&filename).expect("unable to read file");
+    ///     let src = fs::read_to_string(&filename).expect("unable to read file");
     ///     let syntax = syn::parse_file(&src).expect("unable to parse file");
     ///
     ///     // Debug impl is available if Syn is built with "extra-traits" feature.

src/lib.rs

@@ -973,11 +973,11 @@ pub fn parse_str<T: parse::Parse>(s: &str) -> Result<T> {
 ///
 /// ```no_run
 /// use std::error::Error;
-/// use std::fs::read_to_string;
+/// use std::fs;
 /// use std::io::Read;
 ///
 /// fn run() -> Result<(), Box<dyn Error>> {
-///     let content = read_to_string("path/to/code.rs")?;
+///     let content = fs::read_to_string("path/to/code.rs")?;
 ///     let ast = syn::parse_file(&content)?;
 ///     if let Some(shebang) = ast.shebang {
 ///         println!("{}", shebang);