Fix references to the documentation files

Many boot image configuration files refer to the
appropriate documentation file, but these references
contain typos in the directory and file name. Fix
them. Also fix reference to doc/README.SPL file.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/Marvell/dreamplug/kwbimage.cfg b/board/Marvell/dreamplug/kwbimage.cfg
index ca9cd74..e662b2d 100644
--- a/board/Marvell/dreamplug/kwbimage.cfg
+++ b/board/Marvell/dreamplug/kwbimage.cfg
@@ -24,7 +24,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA 02110-1301 USA
 #
-# Refer docs/README.kwimage for more details about how-to configure
+# Refer doc/README.kwbimage for more details about how-to configure
 # and create kirkwood boot image
 #
 
diff --git a/board/Marvell/guruplug/kwbimage.cfg b/board/Marvell/guruplug/kwbimage.cfg
index 2afd927..9baf6bc 100644
--- a/board/Marvell/guruplug/kwbimage.cfg
+++ b/board/Marvell/guruplug/kwbimage.cfg
@@ -21,7 +21,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA 02110-1301 USA
 #
-# Refer docs/README.kwimage for more details about how-to configure
+# Refer doc/README.kwbimage for more details about how-to configure
 # and create kirkwood boot image
 #
 
diff --git a/board/Marvell/mv88f6281gtw_ge/kwbimage.cfg b/board/Marvell/mv88f6281gtw_ge/kwbimage.cfg
index ec2513f..f74d443 100644
--- a/board/Marvell/mv88f6281gtw_ge/kwbimage.cfg
+++ b/board/Marvell/mv88f6281gtw_ge/kwbimage.cfg
@@ -21,7 +21,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA 02110-1301 USA
 #
-# Refer docs/README.kwimage for more details about how-to configure
+# Refer doc/README.kwbimage for more details about how-to configure
 # and create kirkwood boot image
 #
 
diff --git a/board/Marvell/openrd/kwbimage.cfg b/board/Marvell/openrd/kwbimage.cfg
index 757eb28..19d0bac 100644
--- a/board/Marvell/openrd/kwbimage.cfg
+++ b/board/Marvell/openrd/kwbimage.cfg
@@ -21,7 +21,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA 02110-1301 USA
 #
-# Refer docs/README.kwimage for more details about how-to configure
+# Refer doc/README.kwbimage for more details about how-to configure
 # and create kirkwood boot image
 #
 
diff --git a/board/Marvell/rd6281a/kwbimage.cfg b/board/Marvell/rd6281a/kwbimage.cfg
index 0d12dd9..c8b5d74 100644
--- a/board/Marvell/rd6281a/kwbimage.cfg
+++ b/board/Marvell/rd6281a/kwbimage.cfg
@@ -21,7 +21,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA 02110-1301 USA
 #
-# Refer docs/README.kwimage for more details about how-to configure
+# Refer doc/README.kwbimage for more details about how-to configure
 # and create kirkwood boot image
 #