Add docs on how to turn off SSL verification on GH oauth

In gitlab-ee!323 we added support to disable SSL verification because attempting to import projects from a self-signed GH Enterprise instance will fail with an SSL error.

@cpallares Thanks! LGTM 👍

assigned to @rspeicher

approved this merge request

@cpallares Thanks! Just a couple minor adjustments. 👍

assigned to @cpallares

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Thanks, @rspeicher, I have made some modifications 👍

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@cpallares LGTM, thanks! 👍

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mentioned in commit 12762caf