Update documentation for qemu-img convert options, by Marc Bevand.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4671 c046a42c-6fe2-441c-8c8c-71466251a162

qemu-img.texi

@@ -10,7 +10,7 @@ The following commands are supported:
 @table @option
 @item create [-e] [-6] [-b @var{base_image}] [-f @var{fmt}] @var{filename} [@var{size}]
 @item commit [-f @var{fmt}] @var{filename}
-@item convert [-c] [-e] [-6] [-f @var{fmt}] @var{filename} [-O @var{output_fmt}] @var{output_filename}
+@item convert [-c] [-e] [-6] [-f @var{fmt}] [-O @var{output_fmt}] @var{filename} [@var{filename2} [...]] @var{output_filename}
 @item info [-f @var{fmt}] @var{filename}
 @end table