[PATCH] doc: dfu: fix typo in README.dfu

[Chance.Yang]

Fix "ram" typos for serial flash

Signed-off-by: Chance.Yang <chance.yang at vatics.com>
---

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

diff --git a/doc/README.dfu b/doc/README.dfu
index 4b9f883540..be53b5b393 100644
--- a/doc/README.dfu
+++ b/doc/README.dfu
@@ -121,7 +121,7 @@ Commands:
   "sf" (serial flash : NOR)
     cmd: dfu 0 sf <dev>
     each element in "dfu_alt_info" =
-      <name> ram <offset> <size>  raw access to sf device
+      <name> raw <offset> <size>  raw access to sf device
       <name> part <dev> <part_id>  raw acces to partition
       <name> partubi <dev> <part_id>  raw acces to ubi partition
 
-- 
2.17.1