x86: document fdimage/isoimage completely in make help

Add missing targets and missing options in x86 make help

[ mingo@elte.hu: more whitespace cleanups ]
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/Makefile

@@ -239,9 +239,13 @@ define archhelp
   echo  '                  (your) ~/bin/installkernel or'
   echo  '                  (distribution) /sbin/installkernel or'
   echo  '                  install to $$(INSTALL_PATH) and run lilo'
-  echo  '  bzdisk       - Create a boot floppy in /dev/fd0'
-  echo  '  fdimage      - Create a boot floppy image'
-  echo  '  isoimage     - Create a boot CD-ROM image'
+  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
+  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
+  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
+  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
+  echo  '                  bzdisk/fdimage*/isoimage also accept:'
+  echo  '                  FDARGS="..."  arguments for the booted kernel'
+  echo  '                  FDINITRD=file initrd for the booted kernel'
 endef
 
 CLEAN_FILES += arch/x86/boot/fdimage \