Update README to use new group syntax

[SqrtMinusOne]

No description provided.

[ripytide]

Good catch. Actually I don't think I remember reading that commented out section very often since I can just reference the example group file I wonder if we need that bit of docs at all, excluding the bit about apth location which is quite useful.

[SqrtMinusOne]

I wonder if we need that bit of docs at at all

Well, I prefer when syntax is described explicitly to inferring it from examples, at least in important parts. But it's your call.

[ripytide]

Sure, fair enough. Can you change the bit from package =to name = too? As that's wrong also.

[SqrtMinusOne]

Done.

[ripytide]

Thanks