Replace shared include file with platform-specific checksum validation instructions

[Copilot]

The current .NET installation documentation uses a shared include file verify-download-macos-linux.md that attempts to handle both Linux and macOS checksum validation in a single file. This approach creates unnecessary complexity and makes the documentation harder to maintain.

This PR replaces the shared include approach with platform-specific content directly in each article:

Changes made:

• Removed the shared include file docs/core/install/includes/verify-download-macos-linux.md
• Updated docs/core/install/linux-scripted-manual.md with Linux-specific instructions using sha512sum commands
• Updated docs/core/install/macos.md with macOS-specific instructions using shasum -a 512 commands
• Improved example file names to be platform-appropriate (linux-x64 vs osx-x64)

Benefits:

• Each platform article now contains only relevant instructions for its target audience
• Eliminates the complexity of a shared include that tried to handle multiple platforms
• Makes the documentation easier to maintain and update per platform
• Provides clearer, more focused guidance for users on each platform

Platform-specific commands:

• Linux: sha512sum and sha512sum -c {file} --ignore-missing
• macOS: shasum -a 512 and shasum -a 512 -c {file}

Both commands produce identical SHA512 checksums for validation, but use the native tools available on each platform.

Fixes #47112.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

---

Internal previews

📄 File	🔗 Preview link
docs/core/install/linux-scripted-manual.md	docs/core/install/linux-scripted-manual
docs/core/install/macos.md	docs/core/install/macos

[adegeo]

@copilot Instead of the changes you made, can you actually port this into the individual articles that reference the include file, then remove the include file? Adjust the include file's content to be specific to platform covered by the article. So the macos.md file would use content from verify-download-macos-linux.md but altered to be macos specific.

[Copilot]

@copilot Instead of the changes you made, can you actually port this into the individual articles that reference the include file, then remove the include file? Adjust the include file's content to be...

I'll implement this cleaner approach by removing the include file and porting platform-specific content directly into each article. This will eliminate the need for a shared include that tries to handle both platforms.

[BillWagner]

The build warning is unrelated. Closing and reopening for a fresh build

[BillWagner]

@copilot you need to fix the broken links to the images.

[Copilot]

@copilot you need to fix the broken links to the images.

Fixed the broken image links by correcting the paths from ../media/install-sdk/ to media/install-sdk/ in both linux-scripted-manual.md and macos.md. Commit fbab0fb.

[adegeo]

@BillWagner

[BillWagner]

This now LGTM.