Fix mdadm.conf error message and add RHEL/CentOS notes

[kaliti]

Updated error message to use printf and added instructions for RHEL/CentOS.

[learn-build-service-prod]

Learn Build status updates of commit b37a2a0:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/virtual-machines/enable-nvme-temp-faqs.yml	✅Succeeded

For more details, please refer to the build report.

[prmerger-automator]

PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

[Copilot]

Pull Request Overview

This PR fixes a shell scripting error and adds documentation for RHEL/CentOS-specific instructions related to NVMe temporary disk configuration. The change corrects an incorrect use of print to printf in a bash script and provides additional guidance for handling distribution-specific differences.

• Fixed print command to printf in bash script error handling
• Added RHEL/CentOS-specific instructions for initramfs regeneration
• Added guidance for creating mdadm.conf file when missing

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[ttorble]

@ju-shim

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[learn-build-service-prod]

Learn Build status updates of commit 1bf8a0b:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/virtual-machines/enable-nvme-temp-faqs.yml	✅Succeeded

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 4df505f:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/virtual-machines/enable-nvme-temp-faqs.yml	✅Succeeded

For more details, please refer to the build report.

[prmerger-automator]

PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

[ju-shim]

#sign-off

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @