Replace Qemu by QEMU in user visible documentation

The official spelling is QEMU.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

fsdev/virtfs-proxy-helper.texi

@@ -24,7 +24,7 @@ in non-root mode, but doing privileged operations using socket IO.
 Proxy helper(a stand alone binary part of qemu) is invoked with
 root privileges. Proxy helper chroots into 9p export path and creates
 a socket pair or a named socket based on the command line parameter.
-Qemu and proxy helper communicate using this socket. QEMU proxy fs
+QEMU and proxy helper communicate using this socket. QEMU proxy fs
 driver sends filesystem request to proxy helper and receives the
 response from it.
 

qemu-doc.texi

@@ -968,7 +968,7 @@ monitor (@pxref{pcsys_keys}).
 
 QEMU emulates a PCI UHCI USB controller. You can virtually plug
 virtual USB devices or real host USB devices (experimental, works only
-on Linux hosts).  Qemu will automatically create and connect virtual USB hubs
+on Linux hosts).  QEMU will automatically create and connect virtual USB hubs
 as necessary to connect multiple USB devices.
 
 @menu

qemu-nbd.texi

@@ -6,7 +6,7 @@ usage: qemu-nbd [OPTION]...  @var{filename}
 
 @c man begin DESCRIPTION
 
-Export Qemu disk image using NBD protocol.
+Export QEMU disk image using NBD protocol.
 
 @c man end
 

qemu-options.hx

@@ -1310,7 +1310,7 @@ and a @var{name} can be assigned for use in monitor commands.
 Optionally, for PCI cards, you can specify the number @var{v} of MSI-X vectors
 that the card should have; this option currently only affects virtio cards; set
 @var{v} = 0 to disable MSI-X. If no @option{-net} option is specified, a single
-NIC is created.  Qemu can emulate several different models of network card.
+NIC is created.  QEMU can emulate several different models of network card.
 Valid values for @var{type} are
 @code{virtio}, @code{i82551}, @code{i82557b}, @code{i82559er},
 @code{ne2k_pci}, @code{ne2k_isa}, @code{pcnet}, @code{rtl8139},
@@ -2133,7 +2133,7 @@ activates telnet remote echo and single char transfer, then you can
 use the following options to step up a netcat redirector to allow
 telnet on port 5555 to access the qemu port.
 @table @code
-@item Qemu Options:
+@item QEMU Options:
 -serial udp::4555@@:4556
 @item netcat options:
 -u -P 4555 -L 0.0.0.0:4556 -t -p 5555 -I -T