spl: Fix typo in kernel doc

Fix a tiny typo in boot_from_devices() kernel doc.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/common/spl/spl.c b/common/spl/spl.c
index 4ddeff9..d5e3f68 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -535,7 +535,7 @@
 }
 
 /**
- * boot_from_devices() - Try loading an booting U-Boot from a list of devices
+ * boot_from_devices() - Try loading a booting U-Boot from a list of devices
  *
  * @spl_image: Place to put the image details if successful
  * @spl_boot_list: List of boot devices to try