Add local SDK clarification to global.json paths documentation

[Copilot]

This PR updates the documentation for the global.json paths property to explicitly mention that this feature enables using local SDK installations.

The current documentation explains what the paths property does technically, but doesn't clearly communicate one of its key use cases: enabling the use of SDKs that are not installed globally on the system.

cc @dotnet/appmodel @richlander

Changes Made

Added a clarifying sentence to the paths property description in docs/core/tools/global-json.md:

This feature enables using local SDK installations (such as SDKs relative to a repository root or placed in a custom folder) that are not installed globally on the system.

The sentence is positioned after the explanation of how paths are searched, providing logical flow from the technical details to the practical use case.

Impact

This change will help users who are searching for information about how to use local SDKs find this feature more easily. The existing example already demonstrates this concept with the .dotnet path, but the description now makes this use case explicit.

The change is minimal and focused, adding only one sentence without modifying any existing content or functionality.

This pull request was created as a result of the following prompt from Copilot chat.

Update the documentation for the global.json paths property in docs/core/tools/global-json.md to explicitly mention that this feature enables using 'local' SDKs. Add a note or clarifying sentence in the 'paths' property description that paths can be used to specify local SDK installations (such as SDKs checked into a repository or placed in a custom folder), which allows using SDKs that are not installed globally. This should help users searching for how to use local SDKs find this information more easily.

Reference location in the file for the update: https://github.com/dotnet/docs/blob/main/docs/core/tools/global-json.md#paths

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Internal previews

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