Update nrt_FirstAppOrServicePrincipalCredential.yaml

[shainw]

Change(s):

• Map InitiatedByUPNSuffix and InitiatedByName fields properly

Reason for Change(s):

• Entity names mapped incorrectly

Version Updated:

• Yes

Testing Completed:

• Yes

Checked that the validations are passing and have addressed any issues that are present:

• Yes

[contentautomationbot]

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I see that you changed templates under the detections/analytic rules folder. Did you remember to update the version of the templates you changed?
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