MYNEWT-518 Update comments and design doc.
diff --git a/boot/bootutil/src/bootutil_misc.c b/boot/bootutil/src/bootutil_misc.c
index 1119bc2..c85f454 100644
--- a/boot/bootutil/src/bootutil_misc.c
+++ b/boot/bootutil/src/bootutil_misc.c
@@ -73,7 +73,7 @@
/* | slot-0 | slot-1 |
*----------+------------+------------|
* magic | Any | Good |
- * image-ok | Any | N/A |
+ * image-ok | Any | [*] |
* ---------+------------+------------+---------------------------'
* swap: test |
* note: slot-1 image-ok val indicates whether swap is permanent; |