[syslinux] Patching doc/syslinux.txt, partialy because #647603 on Debian

[Regid Ichira]

  My reason for patching circa line 225 is that I think it is
clearer.  The reason for patching circa line 575 is
http://bugs.debian.org/647603.  They concluded that a .0 file is
recognized not only by PXELINUX.  And what is NBP?

--- a/doc/syslinux.txt  2011-12-07 04:53:29.201556663 +0200
+++ b/doc/syslinux.txt  2011-12-07 04:50:11.000000000 +0200
@@ -221,7 +221,6 @@ LABEL label

     The following commands are available after a LABEL statement:

-    LINUX image                        - Linux kernel image (default)
     BOOT image                 - Bootstrap program (.bs, .bin)
     BSS image                  - BSS image (.bss)
     PXE image                  - PXE Network Bootstrap Program (.0)
@@ -229,6 +228,8 @@ LABEL label
     COMBOOT image              - COMBOOT program (.com, .cbt)
     COM32 image                        - COM32 program (.c32)
     CONFIG image               - New configuration file
+    LINUX image                        - Linux kernel image (other file
+                                  name extenstion, no extention)
        Using one of these keywords instead of KERNEL forces the
        filetype, regardless of the filename.

@@ -570,8 +571,7 @@ Because neither Linux kernels, boot sect
 have reliable magic numbers, Syslinux will look at the file extension.
 The following extensions are recognized (case insensitive):

-  none or other        Linux kernel image
-  .0           PXE bootstrap program (NBP) [PXELINUX only]
+  .0           PXE bootstrap program (NBP)
   .bin         "CD boot sector" [ISOLINUX only]
   .bs          Boot sector [SYSLINUX only]
   .bss         Boot sector, DOS superblock will be patched in [SYSLINUX only]
@@ -579,6 +579,7 @@ The following extensions are recognized
   .cbt         COMBOOT image (not runnable from DOS)
   .com         COMBOOT image (runnable from DOS)
   .img         Disk image [ISOLINUX only]
+  none or other        Linux kernel image

 For filenames given on the command line, Syslinux will search for the
 file by adding extensions in the order listed above if the plain