Documentation outdated: docs/how-to/separate-home-disk.md - "Premium SSD coming soon" note is stale

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Problem

docs/how-to/separate-home-disk.md line 205 contains a stale "coming soon" notice:

Note: azlin currently defaults to Standard HDD. Premium SSD support coming soon.

Why This Is Stale

The feature has already been implemented in the Rust rewrite (v2.3.0+). The azlin disk add command fully supports disk SKU selection via the --sku flag:

# Add a Premium SSD disk
azlin disk add (vm) --size 100 --sku Premium_LRS

# Add a Standard SSD disk
azlin disk add (vm) --size 100 --sku StandardSSD_LRS

# Default (Standard HDD)
azlin disk add (vm) --size 100 --sku Standard_LRS

The implementation in rust/crates/azlin-cli/src/lib.rs defines:

/// Disk SKU (Standard_LRS, Premium_LRS, etc.)
#[arg(long, default_value = "Standard_LRS")]
sku: String,

Tests in parity_tests.rs confirm both Standard_LRS and Premium_LRS work.

Suggested Fix

Replace the stale note on line 205 with accurate documentation:

> **Note**: azlin defaults to Standard HDD (`Standard_LRS`). Use `--sku Premium_LRS` 
> for Premium SSD, or `--sku StandardSSD_LRS` for Standard SSD. See [disk add command](#) 
> for all supported SKU types.

Also consider adding a "Disk SKU Options" section documenting the supported values:

• Standard_LRS - Standard HDD (default, lowest cost)
• StandardSSD_LRS - Standard SSD (balanced)
• Premium_LRS - Premium SSD (high performance)
• UltraSSD_LRS - Ultra Disk (if supported in region)

Impact

Users reading this guide will think Premium SSD is not yet available and may avoid using the feature or work around it unnecessarily.

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