Merge pull request rust-lang#2223 from ehuss/derive-export

Update `derive` export locations

Author: traviscross

src/attributes/derive.md

@@ -43,7 +43,12 @@ r[attributes.derive.duplicates]
 The `derive` attribute may be used any number of times on an item. All derive macros listed in all attributes are invoked.
 
 r[attributes.derive.stdlib]
-The `derive` attribute is exported in the standard library prelude as [`core::prelude::v1::derive`].
+The `derive` attribute is exported in the standard library as:
+
+- [`core::derive`]
+- [`std::derive`]
+- [`core::prelude::v1::derive`]
+- [`std::prelude::v1::derive`]
 
 r[attributes.derive.built-in]
 Built-in derives are defined in the [language prelude][names.preludes.lang]. The list of built-in derives are: