man: cgrules.conf - update rule fields allowed characters #1252

Job	Run time
Lint	32s
Differential ShellCheck	0s
Build tests	2m 12s
Cgroup v2 Dist Check	6m 40s
Cgroup v1 Dist Check	6m 14s
Doxygen	14s
Build without systemd enabled	3m 12s
Unit Tests	1m 53s
Checkpatch Review	0s
Cgroup v1 Functional Tests	3m 48s
Cgroup v1/v2 Functional Tests	5m 23s
Cgroup v2 Functional Tests	4m 9s
Finalize the test run	3s
	34m 20s

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