Since Ice Cream Sandwich and Jelly Bean are 25% of the active Android devices out there, but Gingerbread is still over 50% of the active devices, it occurs to me that instructions for changing settings may look very different to people with different devices. Sure, this was a problem before, but it's more pronounced now.
Anyway, my suggestion is that if you're including instructions to someone on how to change a setting in the OS or in an app, include the version of the OS (and app) you're using as a note in your answer.
Yes, I can envision having two separate answers saying virtually the same thing, the only difference being the OS version being referenced, but I don't think that's a bad thing. It's probably better than having nearly-but-not-quite duplicate questions, different only by the OS version.