xrdp.8.in: Fix "SEE ALSO" refs to `xrdp-sesman`, `xrdp-sesrun` #2356

Job	Run time
code formatting check	51s
cppcheck	5m 6s
min features with gcc	2m 27s
min features with g++	4m 26s
min features with clang	3m 30s
max features with gcc	5m 23s
max features with g++	7m 24s
max features with clang	10m 7s
max features with clang and AddressSanitized	3m 34s
max features with gcc and DEBUG	4m 22s
max features with gcc for 32-bit arch (legacy OS)	3m 13s
max features with g++ for 32-bit arch (legacy OS)	3m 53s
max features with clang for 32-bit arch (legacy OS)	3m 33s
	57m 49s

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