Update mde-linux-prerequisites.md

[theabhishek07]

Adds three customer-facing prerequisites to mde-linux-prerequisites.md:

1. Software requirements — Hostname NOTE: Defender for Endpoint reads the hostname from /etc/hostname and uses it to identify the device in the portal. Includes hostname to display it and hostnamectl set-hostname to fix it before install.

2. Network requirements — Strengthened existing TLS WARNING to state that SSL/TLS inspection must be disabled because it breaks the certificate chain the agent relies on.

3. Installation methods and tools — Standalone --pre-req validator block so customers can validate kernel, glibc, fanotify, disk, memory, distro, and filesystem without installing: curl -o mde_installer.sh "https://go.microsoft.com/fwlink/?linkid=2313015" chmod +x mde_installer.sh sudo ./mde_installer.sh --pre-req

Doc-only change. No product behavior change.

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[ShannonLeavitt]

@theabhishek07 - Could you take a moment to sign the CLA? We are unable to process this PR until the CLA is signed.

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