docs: path-lookup: no get_link()

no get_link() anymore. we have step_into() and pick_link().

walk_component() will call step_into(), in turn call pick_link,
and return symlink name.
Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-10-foxhlchen@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/filesystems/path-lookup.rst

@@ -1103,12 +1103,10 @@ doesn't need to notice.  Getting this ``name`` variable on and off the
 stack is very straightforward; pushing and popping the references is
 a little more complex.
 
-When a symlink is found, ``walk_component()`` returns the value ``1``
-(``0`` is returned for any other sort of success, and a negative number
-is, as usual, an error indicator).  This causes ``get_link()`` to be
-called; it then gets the link from the filesystem.  Providing that
-operation is successful, the old path ``name`` is placed on the stack,
-and the new value is used as the ``name`` for a while.  When the end of
+When a symlink is found, ``walk_component()`` calls ``pick_link()`` via ``step_into()``
+which returns the link from the filesystem.
+Providing that operation is successful, the old path ``name`` is placed on the
+stack, and the new value is used as the ``name`` for a while.  When the end of
 the path is found (i.e. ``*name`` is ``'\0'``) the old ``name`` is restored
 off the stack and path walking continues.