docs: qemu: bump to QEMU 5.0.0

Fix the version inconsistency in the same file.

I tested QEMU 5.0.0, and it worked for me.

Change-Id: I9d8ca9aae1e413410eb5676927e13ae4aee9fad8
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
1 file changed