Fix a syntax error in the description text of libvirtd.conf

not yet not -> not yet.
Signed-off-by: NZhang Bo <oscar.zhangbo@huawei.com>

daemon/libvirtd.conf

@@ -272,7 +272,7 @@
 # connection succeeds.
 #max_queued_clients = 1000
 
-# The maximum length of queue of accepted but not yet not
+# The maximum length of queue of accepted but not yet
 # authenticated clients. The default value is zero, meaning
 # the feature is disabled.
 #max_anonymous_clients = 20