[Docs]: `github_membership` does not work with GitHub Enterprise

[drewmullen]

Simple doc fix. This took us ... too long... to figure out

[kfcampbell]

Hmm...I don't think this is true as a blanket statement. Our Enterprise Cloud docs mention that IdP can be enforced for an organization, but don't have to be, and our API reference still provides those endpoints on all flavors of Enterprise.

My guess is that your specific organization is opted into IdP-only accounts, and that's what caused the confusion. Perhaps this could be reworded to make that more clear.

[drewmullen]

@kfcampbell hey thanks for the reply - sorry i missed this. so it turns out youre right...

can you point in the right direction... we have sso enabled... we have employees that have github accounts they already have... how can we use terraform to invite them to our org?

we can have terraform add their AD object to a group to get access but this membership resource fails now that we have sso enabled.

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