Rollup merge of #50588 - ExpHP:i-can-see-my-house-from-here, r=frewsxcv

Move "See also" disambiguation links for primitive types to top

Closes #50384.

<details>
<summary>Images</summary>

![rust-slice](https://user-images.githubusercontent.com/1411280/39843148-caa41c3e-53b7-11e8-8123-b57c25a4d9e0.png)

![rust-isize](https://user-images.githubusercontent.com/1411280/39843146-ca94b384-53b7-11e8-85f3-3f5e5d353a05.png)

</details>

r? @steveklabnik

src/liballoc/slice.rs

@@ -10,6 +10,8 @@
 
 //! A dynamically-sized view into a contiguous sequence, `[T]`.
 //!
+//! *[See also the slice primitive type](../../std/primitive.slice.html).*
+//!
 //! Slices are a view into a block of memory represented as a pointer and a
 //! length.
 //!
@@ -78,8 +80,6 @@
 //! * Further methods that return iterators are [`.split`], [`.splitn`],
 //!   [`.chunks`], [`.windows`] and more.
 //!
-//! *[See also the slice primitive type](../../std/primitive.slice.html).*
-//!
 //! [`Clone`]: ../../std/clone/trait.Clone.html
 //! [`Eq`]: ../../std/cmp/trait.Eq.html
 //! [`Ord`]: ../../std/cmp/trait.Ord.html

src/liballoc/str.rs

@@ -10,6 +10,8 @@
 
 //! Unicode string slices.
 //!
+//! *[See also the `str` primitive type](../../std/primitive.str.html).*
+//!
 //! The `&str` type is one of the two main string types, the other being `String`.
 //! Unlike its `String` counterpart, its contents are borrowed.
 //!
@@ -29,8 +31,6 @@
 //! ```
 //! let hello_world: &'static str = "Hello, world!";
 //! ```
-//!
-//! *[See also the `str` primitive type](../../std/primitive.str.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 

src/libcore/num/f32.rs

@@ -11,9 +11,9 @@
 //! This module provides constants which are specific to the implementation
 //! of the `f32` floating point data type.
 //!
-//! Mathematically significant numbers are provided in the `consts` sub-module.
-//!
 //! *[See also the `f32` primitive type](../../std/primitive.f32.html).*
+//!
+//! Mathematically significant numbers are provided in the `consts` sub-module.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 

src/libcore/num/f64.rs

@@ -11,9 +11,9 @@
 //! This module provides constants which are specific to the implementation
 //! of the `f64` floating point data type.
 //!
-//! Mathematically significant numbers are provided in the `consts` sub-module.
-//!
 //! *[See also the `f64` primitive type](../../std/primitive.f64.html).*
+//!
+//! Mathematically significant numbers are provided in the `consts` sub-module.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 

src/libstd/f32.rs

@@ -11,9 +11,9 @@
 //! This module provides constants which are specific to the implementation
 //! of the `f32` floating point data type.
 //!
-//! Mathematically significant numbers are provided in the `consts` sub-module.
-//!
 //! *[See also the `f32` primitive type](../../std/primitive.f32.html).*
+//!
+//! Mathematically significant numbers are provided in the `consts` sub-module.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 #![allow(missing_docs)]

src/libstd/f64.rs

@@ -11,9 +11,9 @@
 //! This module provides constants which are specific to the implementation
 //! of the `f64` floating point data type.
 //!
-//! Mathematically significant numbers are provided in the `consts` sub-module.
-//!
 //! *[See also the `f64` primitive type](../../std/primitive.f64.html).*
+//!
+//! Mathematically significant numbers are provided in the `consts` sub-module.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 #![allow(missing_docs)]

src/libstd/primitive_docs.rs

@@ -370,6 +370,8 @@ mod prim_unit { }
 //
 /// Raw, unsafe pointers, `*const T`, and `*mut T`.
 ///
+/// *[See also the `std::ptr` module](ptr/index.html).*
+///
 /// Working with raw pointers in Rust is uncommon,
 /// typically limited to a few patterns.
 ///
@@ -444,8 +446,6 @@ mod prim_unit { }
 /// but C APIs hand out a lot of pointers generally, so are a common source
 /// of raw pointers in Rust.
 ///
-/// *[See also the `std::ptr` module](ptr/index.html).*
-///
 /// [`null`]: ../std/ptr/fn.null.html
 /// [`null_mut`]: ../std/ptr/fn.null_mut.html
 /// [`is_null`]: ../std/primitive.pointer.html#method.is_null
@@ -563,6 +563,8 @@ mod prim_array { }
 //
 /// A dynamically-sized view into a contiguous sequence, `[T]`.
 ///
+/// *[See also the `std::slice` module](slice/index.html).*
+///
 /// Slices are a view into a block of memory represented as a pointer and a
 /// length.
 ///
@@ -585,8 +587,6 @@ mod prim_array { }
 /// assert_eq!(x, &[1, 7, 3]);
 /// ```
 ///
-/// *[See also the `std::slice` module](slice/index.html).*
-///
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_slice { }
 
@@ -594,15 +594,13 @@ mod prim_slice { }
 //
 /// String slices.
 ///
+/// *[See also the `std::str` module](str/index.html).*
+///
 /// The `str` type, also called a 'string slice', is the most primitive string
 /// type. It is usually seen in its borrowed form, `&str`. It is also the type
 /// of string literals, `&'static str`.
 ///
-/// Strings slices are always valid UTF-8.
-///
-/// This documentation describes a number of methods and trait implementations
-/// on the `str` type. For technical reasons, there is additional, separate
-/// documentation in the [`std::str`](str/index.html) module as well.
+/// String slices are always valid UTF-8.
 ///
 /// # Examples
 ///
@@ -862,11 +860,11 @@ mod prim_u128 { }
 //
 /// The pointer-sized signed integer type.
 ///
+/// *[See also the `std::isize` module](isize/index.html).*
+///
 /// The size of this primitive is how many bytes it takes to reference any
 /// location in memory. For example, on a 32 bit target, this is 4 bytes
 /// and on a 64 bit target, this is 8 bytes.
-///
-/// *[See also the `std::isize` module](isize/index.html).*
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_isize { }
 
@@ -874,11 +872,11 @@ mod prim_isize { }
 //
 /// The pointer-sized unsigned integer type.
 ///
+/// *[See also the `std::usize` module](usize/index.html).*
+///
 /// The size of this primitive is how many bytes it takes to reference any
 /// location in memory. For example, on a 32 bit target, this is 4 bytes
 /// and on a 64 bit target, this is 8 bytes.
-///
-/// *[See also the `std::usize` module](usize/index.html).*
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_usize { }