docs: path-lookup: update path_to_nameidata() part

No path_to_namei() anymore, step_into() will be called.
Related commit: commit c99687a0 ("fold path_to_nameidata()
into its only remaining caller")
Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-3-foxhlchen@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/filesystems/path-lookup.rst

@@ -453,11 +453,12 @@ to find a definitive answer.
 As the last step of ``walk_component()``, ``step_into()`` will be called either
 directly from walk_component() or from handle_dots().  It calls
 ``handle_mounts()``, to check and handle mount points, in which a new
-``struct path`` containing a counted reference to the new dentry and a
-reference to the new ``vfsmount`` which is only counted if it is
-different from the previous ``vfsmount``.  It then calls
-``path_to_nameidata()`` to install the new ``struct path`` in the
-``struct nameidata`` and drop the unneeded references.
+``struct path`` is created containing a counted reference to the new dentry and
+a reference to the new ``vfsmount`` which is only counted if it is
+different from the previous ``vfsmount``. Then if there is
+a symbolic link, ``step_into()`` calls ``pick_link()`` to deal with it,
+otherwise it installs the new ``struct path`` in the ``struct nameidata``, and
+drops the unneeded references.
 
 This "hand-over-hand" sequencing of getting a reference to the new
 dentry before dropping the reference to the previous dentry may