Fix show-const-contents rustdoc test

Author: faern

src/test/rustdoc/show-const-contents.rs

@@ -51,7 +51,7 @@ pub const MY_TYPE_WITH_STR: MyTypeWithStr = MyTypeWithStr("show this");
 // @has show_const_contents/constant.PI.html '; // 3.14159274f32'
 pub use std::f32::consts::PI;
 
-// @has show_const_contents/constant.MAX.html '= i32::max_value(); // 2_147_483_647i32'
+// @has show_const_contents/constant.MAX.html '= i32::MAX; // 2_147_483_647i32'
 pub use std::i32::MAX;
 
 macro_rules! int_module {