Update document for using --cert in az ad sp create-for-rbac

[jiasli]

Fix #4734

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[dbradish-microsoft]

@jiasli , the "create new" and "use existing" H2 sections have conflicting instructions as to the format of the PEM file.

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[jikuja]

@jiasli , the "create new" and "use existing" H2 sections have conflicting instructions as to the format of the PEM file.

Not really:

• Create new creates aa new secret key and certificate and they are saved into single file
  • this format is required when client logs in
• Use existing(=setup keyCredential on Entra ID application) requires only certificate
  • this format is recommended when setting up entra id side

Current tooling has some un-optimized workflows that cause issues like this.