Rename "Derive macros" section header

This renames it to follow the attribute template. Although I like the
old title, since it describes what it does, I would prefer to not make
exceptions and stay consistent.

Author: ehuss

src/attributes.md

@@ -373,7 +373,7 @@ The following is an index of all built-in attributes.
 [`panic_handler`]: panic.md#the-panic_handler-attribute
 [`path`]: items/modules.md#the-path-attribute
 [`proc_macro_attribute`]: procedural-macros.md#attribute-macros
-[`proc_macro_derive`]: procedural-macros.md#derive-macros
+[`proc_macro_derive`]: macro.proc.derive
 [`proc_macro`]: procedural-macros.md#function-like-procedural-macros
 [`recursion_limit`]: attributes/limits.md#the-recursion_limit-attribute
 [`repr`]: type-layout.md#representations

src/attributes/derive.md

@@ -103,7 +103,7 @@ The `automatically_derived` attribute has no behavior.
 
 [items]: ../items.md
 [derive macro]: macro.proc.derive
-[derive macros]: ../procedural-macros.md#derive-macros
+[derive macros]: macro.proc.derive
 [implementation]: ../items/implementations.md
 [items]: ../items.md
-[procedural macros]: ../procedural-macros.md#derive-macros
+[procedural macros]: macro.proc.derive

src/items/use-declarations.md

@@ -448,7 +448,7 @@ fn main() {
 [associated items]: associated-items.md
 [Attributes]: ../attributes.md
 [Built-in types]: ../types.md
-[Derive macros]: ../procedural-macros.md#derive-macros
+[Derive macros]: macro.proc.derive
 [Enum variants]: enumerations.md
 [extern prelude]: ../names/preludes.md#extern-prelude
 [generic parameters]: generics.md

src/names/namespaces.md

@@ -144,7 +144,7 @@ It is still an error for a [`use` import] to shadow another macro, regardless of
 [closure]: ../expressions/closure-expr.md
 [Constant item declarations]: ../items/constant-items.md
 [Derive macro helpers]: ../procedural-macros.md#derive-macro-helper-attributes
-[Derive macros]: ../procedural-macros.md#derive-macros
+[Derive macros]: macro.proc.derive
 [entity]: ../glossary.md#entity
 [Enum variant constructors]: ../items/enumerations.md
 [enum]: ../items/enumerations.md

src/procedural-macros.md

@@ -131,7 +131,7 @@ expressions], [item] positions, including items in [`extern` blocks], inherent
 and trait [implementations], and [trait definitions].
 
 r[macro.proc.derive]
-## Derive macros
+## The `proc_macro_derive` attribute
 
 r[macro.proc.derive.intro]
 *Derive macros* define new inputs for the [`derive` attribute]. These macros can create new [items] given the token stream of a [struct], [enum], or [union]. They can also define [derive macro helper attributes].
@@ -362,7 +362,7 @@ their equivalent `#[doc = r"str"]` attributes when passed to macros.
 
 [Attribute macros]: #attribute-macros
 [Cargo's build scripts]: ../cargo/reference/build-scripts.html
-[Derive macros]: #derive-macros
+[Derive macros]: macro.proc.derive
 [Function-like macros]: #function-like-procedural-macros
 [`$crate`]: macro.decl.hygiene.crate
 [`Delimiter::None`]: proc_macro::Delimiter::None
@@ -396,3 +396,17 @@ their equivalent `#[doc = r"str"]` attributes when passed to macros.
 [type expressions]: types.md#type-expressions
 [type]: types.md
 [union]: items/unions.md
+
+<script>
+(function() {
+    var fragments = {
+        "#derive-macros": "procedural-macros.html#the-proc_macro_derive-attribute",
+    };
+    var target = fragments[window.location.hash];
+    if (target) {
+        var url = window.location.toString();
+        var base = url.substring(0, url.lastIndexOf('/'));
+        window.location.replace(base + "/" + target);
+    }
+})();
+</script>