Update manuel grouping column-grouping.mdx

[Melihkrkvk]

A way for those who want to do ssr grouping with nextjs

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[KevinVandy]

I would like to add some example code here, but not sure this is good. It's not the minimum relevant code that it needed for docs. It looks like you pretty much copy pasted something out of your own code with a bunch of unneeded implementation details.

[Melihkrkvk]

I would like to add some example code here, but not sure this is good. It's not the minimum relevant code that it needed for docs. It looks like you pretty much copy pasted something out of your own code with a bunch of unneeded implementation details.

If you want I will edit that commit for generic usage

[aarjithn]

@Melihkrkvk yes please do - I was looking for an example for manual grouping but couldn't find it both here or Tanstack table docs