Add a note mentioning spam waves to the Autoflagging Preferences page #981
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Rationale
Autoflags for spam waves specifically are automatically cast for users with the Checkbox to enable MS flagging, regardless of their autoflagging preferences (or lack thereof). This should be documented somewhere, as it is bad practice to cast flags without giving them a heads-up first, especially as it isn't explained anywhere.
Spam wave autoflagging has also been discussed multiple times in CHQ.
TODO