Add links to other walkdir items in WalkDir docs

Fixes #29

src/lib.rs

@@ -162,7 +162,7 @@ pub type Result<T> = ::std::result::Result<T, Error>;
 ///
 /// This type implements `IntoIterator` so that it may be used as the subject
 /// of a `for` loop. You may need to call `into_iter` explicitly if you want
-/// to use iterator adapters such as `filter_entry`.
+/// to use iterator adapters such as [`filter_entry`].
 ///
 /// Idiomatic use of this type should use method chaining to set desired
 /// options. For example, this only shows entries with a depth of `1`, `2`
@@ -184,9 +184,11 @@ pub type Result<T> = ::std::result::Result<T, Error>;
 /// # }
 /// ```
 ///
+/// [`filter_entry`]: struct.IntoIter.html#method.filter_entry
+///
 /// Note that the iterator by default includes the top-most directory. Since
 /// this is the only directory yielded with depth `0`, it is easy to ignore it
-/// with the `min_depth` setting:
+/// with the [`min_depth`] setting:
 ///
 /// ```rust,no_run
 /// use walkdir::WalkDir;
@@ -204,6 +206,8 @@ pub type Result<T> = ::std::result::Result<T, Error>;
 /// # }
 /// ```
 ///
+/// [`min_depth`]: struct.WalkDir.html#method.min_depth
+///
 /// This will only return descendents of the `foo` directory and not `foo`
 /// itself.
 ///