Rollup merge of rust-lang#37372 - vtduncan:pathbuf-docs-link, r=steveklabnik

Link to PathBuf from the Path docs

I got stuck trying to use `Path` when `PathBuf` was what I needed. Hopefully this makes `PathBuf` and the module docs a bit easier to find for others.

r? @steveklabnik

Author: Jonathan Turner

src/libstd/path.rs

@@ -1294,14 +1294,18 @@ impl Into<OsString> for PathBuf {
 /// This type supports a number of operations for inspecting a path, including
 /// breaking the path into its components (separated by `/` or `\`, depending on
 /// the platform), extracting the file name, determining whether the path is
-/// absolute, and so on. More details about the overall approach can be found in
-/// the module documentation.
+/// absolute, and so on.
 ///
 /// This is an *unsized* type, meaning that it must always be used behind a
-/// pointer like `&` or [`Box`].
+/// pointer like `&` or [`Box`]. For an owned version of this type,
+/// see [`PathBuf`].
 ///
 /// [`str`]: ../primitive.str.html
 /// [`Box`]: ../boxed/struct.Box.html
+/// [`PathBuf`]: struct.PathBuf.html
+///
+/// More details about the overall approach can be found in
+/// the module documentation.
 ///
 /// # Examples
 ///