remove two links to the first edition

Author: steveklabnik

src/attributes.md

@@ -173,8 +173,7 @@ which can be used to control type layout.
 - `macro_use` on an `extern crate` — load macros from this crate.  An optional
   list of names `#[macro_use(foo, bar)]` restricts the import to just those
   macros named.  The `extern crate` must appear at the crate root, not inside
-  `mod`, which ensures proper function of the [`$crate` macro
-  variable](../book/first-edition/macros.html#the-variable-crate).
+  `mod`, which ensures proper function of the `$crate` macro variable.
 
 - `macro_reexport` on an `extern crate` — re-export the named macros.
 
@@ -183,10 +182,6 @@ which can be used to control type layout.
 - `no_link` on an `extern crate` — even if we load this crate for macros, don't
   link it into the output.
 
-See the [macros section of the first edition of the
-book](../book/first-edition/macros.html#scoping-and-macro-importexport) for more
-information on `macro_rules` macro scope.
-
 - `proc_macro` - Defines a [function-like macro].
 
 - `proc_macro_derive` - Defines a [derive mode macro].