Remove outdated service principal ID docs
Remove outdated service principal ID docs

The official tutorial for finding the various auth keys is a much better reference, so remove the inline instructions and just refer to that.

v-iam/azure-sdk-for-python,Azure/azure-sdk-for-python,Azure/azure-sdk-for-python,AutorestCI/azure-sdk-for-python,Azure/azure-sdk-for-python,SUSE/azure-sdk-for-python,lmazuel/azure-sdk-for-python,Azure/azure-sdk-for-python