docs: Add slirp option to the list of runqemu arguments

With default network settings of runqemu script Oniro images start without IP address assigned which may cause inconvenience for some users. Using user network allows network access from the Oniro VM and enables port forwarding for ssh access.

Signed-off-by: Pavel Zhukov pavel.zhukov@huawei.com

Closes: #651 (closed)