Adjust position of rules attached to headers

Adjusts the position of rules with headers to match the style from
#1710

src/keywords.md

@@ -1,16 +1,14 @@
-# Keywords
-
 r[lex.keywords]
+# Keywords
 
 Rust divides keywords into three categories:
 
 * [strict](#strict-keywords)
 * [reserved](#reserved-keywords)
 * [weak](#weak-keywords)
 
-## Strict keywords
-
 r[lex.keywords.strict]
+## Strict keywords
 
 r[lex.keywords.strict.intro]
 These keywords can only be used in their correct contexts. They cannot
@@ -71,9 +69,8 @@ The following keywords were added beginning in the 2018 edition.
 > KW_AWAIT          : `await`\
 > KW_DYN            : `dyn`
 
-## Reserved keywords
-
 r[lex.keywords.reserved]
+## Reserved keywords
 
 r[lex.keywords.reserved.intro]
 These keywords aren't used yet, but they are reserved for future use. They have
@@ -107,9 +104,8 @@ The following keywords are reserved beginning in the 2024 edition.
 > **<sup>Lexer 2024+</sup>**\
 > KW_GEN   : `gen`
 
-## Weak keywords
-
 r[lex.keywords.weak]
+## Weak keywords
 
 r[lex.keywords.weak.intro]
 These keywords have special meaning only in certain contexts. For example, it

src/lifetime-elision.md

@@ -1,13 +1,11 @@
-# Lifetime elision
-
 r[lifetime-elision]
+# Lifetime elision
 
 Rust has rules that allow lifetimes to be elided in various places where the
 compiler can infer a sensible default choice.
 
-## Lifetime elision in functions
-
 r[lifetime-elision.function]
+## Lifetime elision in functions
 
 r[lifetime-elision.function.intro]
 In order to make common patterns more ergonomic, lifetime arguments can be
@@ -91,9 +89,8 @@ fn frob(s: &str, t: &str) -> &str;                    // ILLEGAL
 # }
 ```
 
-## Default trait object lifetimes
-
 r[lifetime-elision.trait-object]
+## Default trait object lifetimes
 
 r[lifetime-elision.trait-object.intro]
 The assumed lifetime of references held by a [trait object] is called its

src/macros.md

@@ -1,6 +1,5 @@
-# Macros
-
 r[macro]
+# Macros
 
 r[macro.intro]
 The functionality and syntax of Rust can be extended with custom definitions
@@ -13,9 +12,8 @@ There are two ways to define new macros:
 * [Procedural Macros] define function-like macros, custom derives, and custom
   attributes using functions that operate on input tokens.
 
-## Macro Invocation
-
 r[macro.invocation]
+## Macro Invocation
 
 r[macro.invocation.syntax]
 > **<sup>Syntax</sup>**\

src/memory-allocation-and-lifetime.md

@@ -1,6 +1,5 @@
-# Memory allocation and lifetime
-
 r[alloc]
+# Memory allocation and lifetime
 
 r[alloc.static]
 The _items_ of a program are those functions, modules, and types that have their

src/names.md

@@ -1,6 +1,5 @@
-# Names
-
 r[names]
+# Names
 
 r[names.intro]
 An *entity* is a language construct that can be referred to in some way within
@@ -36,9 +35,8 @@ and labels to entity declarations.
 r[names.visibility]
 Access to certain names may be restricted based on their [*visibility*].
 
-## Explicitly declared entities
-
 r[names.explicit]
+## Explicitly declared entities
 
 r[names.explicit.list]
 Entities that explicitly introduce a name in the source code are:
@@ -87,9 +85,8 @@ r[names.explicit.macro-invocation]
 Additionally, [macro invocations] and [attributes] can introduce names by
 expanding to one of the above items.
 
-## Implicitly declared entities
-
 r[names.implicit]
+## Implicitly declared entities
 
 r[names.implicit.list]
 The following entities are implicitly defined by the language, or are

src/paths.md

@@ -1,6 +1,5 @@
-# Paths
-
 r[paths]
+# Paths
 
 r[paths.intro]
 A *path* is a sequence of one or more path segments separated by `::` tokens.
@@ -16,9 +15,8 @@ x::y::z;
 
 ## Types of paths
 
-### Simple Paths
-
 r[paths.simple]
+### Simple Paths
 
 r[paths.simple.syntax]
 > **<sup>Syntax</sup>**\
@@ -40,9 +38,8 @@ mod m {
 }
 ```
 
-### Paths in expressions
-
 r[paths.expr]
+### Paths in expressions
 
 r[paths.expr.syntax]
 > **<sup>Syntax</sup>**\
@@ -99,9 +96,8 @@ r[paths.expr.impl-trait-params]
 The synthetic type parameters corresponding to `impl Trait` types are implicit,
 and these cannot be explicitly specified.
 
-## Qualified paths
-
 r[paths.qualified]
+## Qualified paths
 
 r[paths.qualified.syntax]
 > **<sup>Syntax</sup>**\
@@ -137,9 +133,8 @@ S::f();  // Calls the inherent impl.
 <S as T2>::f();  // Calls the T2 trait function.
 ```
 
-### Paths in types
-
 r[paths.type]
+### Paths in types
 
 r[paths.type.syntax]
 > **<sup>Syntax</sup>**\
@@ -179,16 +174,14 @@ fn i<'a>() -> impl Iterator<Item = ops::Example<'a>> {
 type G = std::boxed::Box<dyn std::ops::FnOnce(isize) -> isize>;
 ```
 
-## Path qualifiers
-
 r[paths.qualifiers]
+## Path qualifiers
 
 Paths can be denoted with various leading qualifiers to change the meaning of
 how it is resolved.
 
-### `::`
-
 r[paths.qualifiers.global-root]
+### `::`
 
 r[paths.qualifiers.global-root.intro]
 Paths starting with `::` are considered to be *global paths* where the segments of the path
@@ -227,9 +220,8 @@ mod b {
 # fn main() {}
 ```
 
-### `self`
-
 r[paths.qualifiers.mod-self]
+### `self`
 
 r[paths.qualifiers.mod-self.intro]
 `self` resolves the path relative to the current module.
@@ -254,9 +246,8 @@ impl S {
 # fn main() {}
 ```
 
-### `Self`
-
 r[paths.qualifiers.type-self]
+### `Self`
 
 r[paths.qualifiers.type-self.intro]
 `Self`, with a capital "S", is used to refer to the current type being implemented or defined. It may be used in the following situations:
@@ -319,9 +310,8 @@ struct NonEmptyList<T> {
 }
 ```
 
-### `super`
-
 r[paths.qualifiers.super]
+### `super`
 
 r[paths.qualifiers.super.intro]
 `super` in a path resolves to the parent module.
@@ -361,9 +351,8 @@ mod a {
 # fn main() {}
 ```
 
-### `crate`
-
 r[paths.qualifiers.crate]
+### `crate`
 
 r[paths.qualifiers.crate.intro]
 `crate` resolves the path relative to the current crate.
@@ -381,9 +370,8 @@ mod a {
 # fn main() {}
 ```
 
-### `$crate`
-
 r[paths.qualifiers.macro-crate]
+### `$crate`
 
 r[paths.qualifiers.macro-crate.allowed-positions]
 `$crate` is only used within [macro transcribers], and can only be used as the first
@@ -406,9 +394,8 @@ macro_rules! inc {
 # fn main() { }
 ```
 
-## Canonical paths
-
 r[paths.canonical]
+## Canonical paths
 
 r[paths.canonical.intro]
 Items defined in a module or implementation have a *canonical path* that