fix(docs): Correct default rollForward policy in global.json documentation

[nileshsheth]

📜 Description

This PR updates the global-json.md documentation to correctly reflect the default rollForward behavior in the .NET SDK.

🔍 Issue

The documentation previously stated:

If no rollForward value is set, it uses latestPatch as the default rollForward policy.

However, based on actual SDK behavior and tracing logs (see dotnet/core-setup#6953), the default policy is actually patch, not latestPatch.

🛠 Fix

• Updated the incorrect statement in global-json.md to specify patch as the default rollForward policy.
• This aligns the documentation with the real behavior of the .NET SDK.

📎 Related Issues

• Fixes fixed Visual Studio Code branding #2246 (if an issue exists in the repo).
• References Implement roll-forward policies for .NET Core SDK resolution. core-setup#6953.

📸 Verification

✅ The demo provided in the issue confirms that patch is the default policy.
✅ Tracing logs explicitly state rollForward = 'patch'.

📂 Files Changed

• docs/core/tools/global-json.md

🔗 Additional Context

For backwards compatibility, the SDK defaults to patch when rollForward is not specified in global.json. This update ensures that the documentation accurately reflects this behavior.

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Internal previews

📄 File	🔗 Preview link
docs/core/tools/global-json.md	global.json overview

[gewarren]

@JL03-Yue are you able to verify this change?

[gewarren]

@adegeo Are you familiar with this at all?

[adegeo]

I can't tell if this is a bot or not...

What does this have to do with this PR?

Fixes Visual Studio Code branding (if an issue exists in the repo).

The linked PR that's referenced here indicates in the discussion that the default was actually not changed, though the initial comment indicates it would be.

References Implement roll-forward policies for .NET Core SDK resolution. core-setup#6953.

This is the same link as above, there aren't tracing logs? So I don't know what this is referencing.

However, based on actual SDK behavior and tracing logs (see core-setup#6953, the default policy is actually patch, not latestPatch.