Rollup merge of #41243 - projektir:prim_str_docs, r=GuillaumeGomez

Minor nits in primitive str

Some minor updates to linking, added some links, doc format, etc.

r? @GuillaumeGomez

src/libcollections/str.rs

@@ -325,8 +325,10 @@ impl str {
 
     /// Returns a subslice of `str`.
     ///
-    /// This is the non-panicking alternative to indexing the `str`. Returns `None` whenever
-    /// equivalent indexing operation would panic.
+    /// This is the non-panicking alternative to indexing the `str`. Returns
+    /// [`None`] whenever equivalent indexing operation would panic.
+    ///
+    /// [`None`]: option/enum.Option.html#variant.None
     ///
     /// # Examples
     ///
@@ -346,8 +348,10 @@ impl str {
 
     /// Returns a mutable subslice of `str`.
     ///
-    /// This is the non-panicking alternative to indexing the `str`. Returns `None` whenever
-    /// equivalent indexing operation would panic.
+    /// This is the non-panicking alternative to indexing the `str`. Returns
+    /// [`None`] whenever equivalent indexing operation would panic.
+    ///
+    /// [`None`]: option/enum.Option.html#variant.None
     ///
     /// # Examples
     ///
@@ -570,7 +574,7 @@ impl str {
         core_str::StrExt::split_at_mut(self, mid)
     }
 
-    /// Returns an iterator over the `char`s of a string slice.
+    /// Returns an iterator over the [`char`]s of a string slice.
     ///
     /// As a string slice consists of valid UTF-8, we can iterate through a
     /// string slice by [`char`]. This method returns such an iterator.
@@ -1657,13 +1661,13 @@ impl str {
 
     /// Parses this string slice into another type.
     ///
-    /// Because `parse()` is so general, it can cause problems with type
-    /// inference. As such, `parse()` is one of the few times you'll see
+    /// Because `parse` is so general, it can cause problems with type
+    /// inference. As such, `parse` is one of the few times you'll see
     /// the syntax affectionately known as the 'turbofish': `::<>`. This
     /// helps the inference algorithm understand specifically which type
     /// you're trying to parse into.
     ///
-    /// `parse()` can parse any type that implements the [`FromStr`] trait.
+    /// `parse` can parse any type that implements the [`FromStr`] trait.
     ///
     /// [`FromStr`]: str/trait.FromStr.html
     ///
@@ -1746,7 +1750,7 @@ impl str {
     ///
     /// `replacen` creates a new [`String`], and copies the data from this string slice into it.
     /// While doing so, it attempts to find matches of a pattern. If it finds any, it
-    /// replaces them with the replacement string slice at most `N` times.
+    /// replaces them with the replacement string slice at most `count` times.
     ///
     /// [`String`]: string/struct.String.html
     ///
@@ -1892,33 +1896,40 @@ impl str {
         return s;
     }
 
-    /// Escapes each char in `s` with `char::escape_debug`.
+    /// Escapes each char in `s` with [`char::escape_debug`].
+    ///
+    /// [`char::escape_debug`]: primitive.char.html#method.escape_debug
     #[unstable(feature = "str_escape",
                reason = "return type may change to be an iterator",
                issue = "27791")]
     pub fn escape_debug(&self) -> String {
         self.chars().flat_map(|c| c.escape_debug()).collect()
     }
 
-    /// Escapes each char in `s` with `char::escape_default`.
+    /// Escapes each char in `s` with [`char::escape_default`].
+    ///
+    /// [`char::escape_default`]: primitive.char.html#method.escape_default
     #[unstable(feature = "str_escape",
                reason = "return type may change to be an iterator",
                issue = "27791")]
     pub fn escape_default(&self) -> String {
         self.chars().flat_map(|c| c.escape_default()).collect()
     }
 
-    /// Escapes each char in `s` with `char::escape_unicode`.
+    /// Escapes each char in `s` with [`char::escape_unicode`].
+    ///
+    /// [`char::escape_unicode`]: primitive.char.html#method.escape_unicode
     #[unstable(feature = "str_escape",
                reason = "return type may change to be an iterator",
                issue = "27791")]
     pub fn escape_unicode(&self) -> String {
         self.chars().flat_map(|c| c.escape_unicode()).collect()
     }
 
-    /// Converts a `Box<str>` into a [`String`] without copying or allocating.
+    /// Converts a [`Box<str>`] into a [`String`] without copying or allocating.
     ///
     /// [`String`]: string/struct.String.html
+    /// [`Box<str>`]: boxed/struct.Box.html
     ///
     /// # Examples
     ///

src/libstd/primitive_docs.rs

@@ -406,7 +406,7 @@ mod prim_slice { }
 ///
 /// 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` module](str/index.html) as well.
+/// documentation in the [`std::str`](str/index.html) module as well.
 ///
 /// # Examples
 ///
@@ -425,7 +425,7 @@ mod prim_slice { }
 /// # Representation
 ///
 /// A `&str` is made up of two components: a pointer to some bytes, and a
-/// length. You can look at these with the [`.as_ptr`] and [`len`] methods:
+/// length. You can look at these with the [`as_ptr`] and [`len`] methods:
 ///
 /// ```
 /// use std::slice;
@@ -452,11 +452,11 @@ mod prim_slice { }
 /// assert_eq!(s, Ok(story));
 /// ```
 ///
-/// [`.as_ptr`]: #method.as_ptr
+/// [`as_ptr`]: #method.as_ptr
 /// [`len`]: #method.len
 ///
 /// Note: This example shows the internals of `&str`. `unsafe` should not be
-/// used to get a string slice under normal circumstances. Use `.as_slice()`
+/// used to get a string slice under normal circumstances. Use `as_slice`
 /// instead.
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_str { }