Make multicopter position control parameter descriptions more concise #27308

Job	Run time
build (check_format)	1m 8s
build (check_newlines)	1m 33s
build (tests)	5m 51s
build (tests_coverage)	7m 29s
build (px4_fmu-v2_default stack_check)	3m 17s
build (validate_module_configs)	53s
build (shellcheck_all)	1m 37s
build (NO_NINJA_BUILD=1 px4_fmu-v5_default)	4m 25s
build (NO_NINJA_BUILD=1 px4_sitl_default)	3m 31s
build (px4_sitl_allyes)	4m 24s
build (module_documentation)	59s
	35m 7s

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