Head over to windowsphone.com now and you'll get redirected to https://www.microsoft.com/en-us/windows/phones, which will look like:
With a slightly revisionist hat on, the bottom link refers to your 'Windows 7, Windows 8 or Windows 8.1 Phone', when these were obviously 'Windows Phone 7', 'Windows Phone 8', and so on. But in the overall scheme of things, this is semantics and you can forgive Microsoft a little rebranding here and there in the effort to make sure everyone 'gets' the continuity in heritage, even if the finer details of binaries and runtimes threaten to muddy these waters if you delve too deeply.
You don't have to worry about memorising a new URL since Microsoft will keep the redirect going for several years at least.