Would be great if each doc page had something identifying which mongodb version(s) page & commands on it apply to. It can be extremely frustrating to have to read the fine print to determine that a function is not available in version I am using. Would make it nice and crystal clear if every page had this option.

For example, msdn.microsoft.com has a 'versions' dropdown, so you can get the exact details that apply to a particular .net framework version. See attached for example