Add doc-comment for `/mob/living/silicon/pai/proc/set_holochassis` #5

Job	Run time
Lint with OpenDream	34s
Run Linters	2m 52s
Collect data for other tasks	10s
Compile Maps	1m 19s
Windows Build	2m 18s
Integration Tests (boxstation) / run_integration_tests	1m 42s
Integration Tests (deltastation) / run_integration_tests	1m 47s
Integration Tests (icebox) / run_integration_tests	1m 36s
Integration Tests (kilostation) / run_integration_tests	1m 42s
Integration Tests (metastation) / run_integration_tests	1m 48s
Integration Tests (multiz_debug) / run_integration_tests	1m 47s
Integration Tests (northstar) / run_integration_tests	1m 41s
Integration Tests (runtimestation) / run_integration_tests	1m 43s
Integration Tests (tramstation) / run_integration_tests	1m 51s
Alternate Tests (515, 1627, runtimestation) / run_integration_tests	1m 40s
Check Alternate Tests	0s
Compare Screenshot Tests	12s
	24m 42s

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