nx-X11/programs/Xserver/hw/nxagent/man/nxagent.1: Fix groff error rep… #185

Job	Run time
Build on ubuntu:16.04 - gcc	9m 1s
Build on ubuntu:16.04 - clang	8m 0s
Build on ubuntu:20.04 - gcc	12m 41s
Build on ubuntu:20.04 - clang	10m 32s
Build on ubuntu:22.04 - gcc	9m 11s
Build on ubuntu:22.04 - clang	10m 6s
Build on debian:stable - gcc	9m 55s
Build on debian:stable - clang	10m 9s
Build on debian:sid - gcc	10m 0s
Build on debian:sid - clang	11m 50s
Build on quay.io/centos/centos:7 - gcc	8m 29s
Build on quay.io/centos/centos:7 - clang	9m 51s
Build on quay.io/centos/centos:stream8 - gcc	11m 53s
Build on quay.io/centos/centos:stream8 - clang	12m 27s
Build on quay.io/centos/centos:stream9 - gcc	10m 19s
Build on quay.io/centos/centos:stream9 - clang	11m 22s
Build on fedora:latest - gcc	11m 2s
Build on fedora:latest - clang	13m 18s
	3h 10m 6s

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