Remove unbalance parentheses from example in Arm.
name: Bug report
The example shown in chapter 8.2.12 DHCPv4 Private Options has single parentheses:
doc/sphinx/arm/dhcp4-srv.rst: "test": "(option[vendor-class-identifier].text == 'APC'",
doc/sphinx/arm/dhcp4-srv.rst: "test": "(option[vendor-class-identifier].text == 'PXE'",
see RT 17358.
Edited by Peter Davies