Code Update: Fix image filenames

"image-initramfs" is no longer built. It was removed here:
https://github.com/openbmc/skeleton/commit/62d11c3e0d98e9a3f8908ec934698f90a55435fb
Also correct several image filenames and updated some wording.

After building a palmetto:
ls -l  image-*
lrwxrwxrwx 2 gmills gmills 54 Jul 26 13:08 image-bmc -> obmc-phosphor-image-palmetto-20180726180322.static.mtd
lrwxrwxrwx 2 gmills gmills 45 Jul 26 13:08 image-kernel -> fitImage-obmc-phosphor-initramfs-palmetto.bin
lrwxrwxrwx 2 gmills gmills 40 Jul 26 13:08 image-rofs -> obmc-phosphor-image-palmetto.squashfs-xz
lrwxrwxrwx 2 gmills gmills 10 Jul 26 13:08 image-rwfs -> rwfs.jffs2
lrwxrwxrwx 2 gmills gmills 10 Jul 26 13:08 image-u-boot -> u-boot.bin

Change-Id: Ic7a9530509bd415c4edb0de70e009745a3268432
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/code-update/code-update.md b/code-update/code-update.md
index dcef10c..f3bc707 100644
--- a/code-update/code-update.md
+++ b/code-update/code-update.md
@@ -17,19 +17,15 @@
 `tmp/deploy/images/<platform>/`. The `image-*` symlinks correspond to components
 that can be updated on the BMC:
 
- * `image-bmc` → `flash-<platform>-<timestamp>`
+ * `image-bmc` → `obmc-phosphor-image-<platform>-<timestamp>.static.mtd`
 
-    The whole-of-flash image for the BMC
+    The complete flash image for the BMC
 
- * `image-initramfs` → `core-image-minimal-initramfs-palmetto.cpio.lzma.u-boot`
+ * `image-kernel` → `fitImage-obmc-phosphor-initramfs-<platform>.bin`
 
-    The small initramfs image; used for early init and flash management
+    The OpenBMC kernel FIT image (including the kernel, device tree, and initramfs)
 
- * `image-kernel` → `cuImage`
-
-    The OpenBMC kernel cuImage (combined kernel and device tree)
-
- * `image-rofs` → `obmc-phosphor-image-palmetto.squashfs-xz`
+ * `image-rofs` → `obmc-phosphor-image-<platform>.squashfs-xz`
 
     The read-only OpenBMC filesystem
 
@@ -45,12 +41,13 @@
 
  * `<platform>-<timestamp>.all.tar`
 
-    The complete BMC flash content: A single file wrapped in a tar archive
+    The complete BMC flash content: A single file (`image-bmc`) wrapped in a
+    tar archive.
 
  * `<platform>-<timestamp>.tar`
 
     Partitioned BMC flash content: Multiple files wrapped in a tar archive,
-    one for each of the u-boot, kernel, initramfs, ro and rw partitions.
+    one for each of the u-boot, kernel, ro and rw partitions.
 
 Preparing for BMC code Update
 -----------------------------