Add note: Don't break RH machines while connected to running RH machines

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Duh!

Time: 2020-11-09 12:38:39 MST
Description: Ticking block entity

java.lang.NullPointerException
at com.globbypotato.rockhounding_chemistry.machines.tile.TEMetalAlloyer.process(TEMetalAlloyer.java:327)
at com.globbypotato.rockhounding_chemistry.machines.tile.TEMetalAlloyer.TickCentral_TrueITickableUpdate(TEMetalAlloyer.java:282)

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Fixed 12.2.51