doc: Minor typo fix.

Thanks to agraf_, stefanha and Snader_LB for their IRC assistance.

Thanks to Markus Armbruster and Alexander Graf (again) for their
assistance with the second version of this patch. No patch is too
simple to test...
Signed-off-by: NBrad Hards <bradh@frogmouth.net>
Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@gmail.com>

qemu-options.hx

@@ -1177,9 +1177,9 @@ Specify the guest-visible address of the host. Default is the 2nd IP in the
 guest network, i.e. x.x.x.2.
 
 @item restrict=y|yes|n|no
-If this options is enabled, the guest will be isolated, i.e. it will not be
+If this option is enabled, the guest will be isolated, i.e. it will not be
 able to contact the host and no guest IP packets will be routed over the host
-to the outside. This option does not affect explicitly set forwarding rule.
+to the outside. This option does not affect any explicitly set forwarding rules.
 
 @item hostname=@var{name}
 Specifies the client hostname reported by the builtin DHCP server.