fix doc of using raw values with sendkey

(qemu) sendkey a
(qemu) sendkey 0x1e
(qemu) sendkey #0x1e
 unknown key: '#0x1e'

The last command doesn't work, '#' is not requested before
raw values, and the raw value in decimal format is not supported.

Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
(cherry picked from commit 886cc706ce5d4d3d1c296f028ddc2991cfbe3bbe)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

hmp-commands.hx

@@ -512,9 +512,9 @@ STEXI
 @item sendkey @var{keys}
 @findex sendkey
 
-Send @var{keys} to the emulator. @var{keys} could be the name of the
-key or @code{#} followed by the raw value in either decimal or hexadecimal
-format. Use @code{-} to press several keys simultaneously. Example:
+Send @var{keys} to the guest. @var{keys} could be the name of the
+key or the raw value in hexadecimal format. Use @code{-} to press
+several keys simultaneously. Example:
 @example
 sendkey ctrl-alt-f1
 @end example