[PATCH] doc: spl: update reference to driver-model/README.txt

[Patrick Delaunay]

Update the reference in doc/README.SPL to a no more existing file:
"driver-model/README.txt", it is changed to "doc/driver-model/design.rst".

Adding the directory path /doc/ allows to check this reference with
'make refcheckdocs'.

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
---

 doc/README.SPL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/README.SPL b/doc/README.SPL
index 929b9672b0..2beb6d8f11 100644
--- a/doc/README.SPL
+++ b/doc/README.SPL
@@ -81,7 +81,7 @@ fdtgrep is also used to remove:
   ('u-boot,dm-pre-reloc', 'u-boot,dm-spl' and 'u-boot,dm-tpl')
 
 All the nodes remaining in the SPL devicetree are bound
-(see driver-model/README.txt).
+(see doc/driver-model/design.rst).
 
 Debugging
 ---------
-- 
2.17.1