fs/f2fs: clarify help messages

For BR2_TARGET_ROOTFS_F2FS_COLD_FILES clarify that extension list must
be a coma separated.

For BR2_TARGET_ROOTFS_F2FS_OVERPROVISION clarify that the default
overprovision ratio is autocalculated according to the partition size.

Signed-off-by: Grzegorz Blach <grzegorz@blach.pl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

fs/f2fs/Config.in

@@ -21,9 +21,10 @@ config BR2_TARGET_ROOTFS_F2FS_SIZE
 config BR2_TARGET_ROOTFS_F2FS_COLD_FILES
 	string "extension list for cold files"
 	help
-	  Specify a file extension list in order f2fs to treat them as
-	  cold files. The default list includes most of multimedia
-	  file extensions such as jpg, gif, mpeg, mkv, and so on.
+	  Specify a comma separated file extension list in order f2fs
+	  to treat them as cold files. The default list includes most
+	  of multimedia file extensions such as jpg, gif, mpeg, mkv,
+	  and so on.
 
 config BR2_TARGET_ROOTFS_F2FS_OVERPROVISION
 	int "overprovision ratio"
@@ -33,8 +34,8 @@ config BR2_TARGET_ROOTFS_F2FS_OVERPROVISION
 	  area. This area is hidden to users, and utilized by F2FS
 	  cleaner.
 
-	  Leave at 0 to use the default overprovision ratio of
-	  mkfs.f2fs.
+	  Leave at 0 for autocalculation according to the partition
+	  size.
 
 config BR2_TARGET_ROOTFS_F2FS_DISCARD
 	bool "discard policy"