Clarify preview behavior of remote GitHub MCP server (#56731)

Author: saritai

content/copilot/how-tos/context/model-context-protocol/using-the-github-mcp-server.md

@@ -12,7 +12,9 @@ redirect_from:
 ---
 
 >[!NOTE]
-> The {% data variables.product.github %} MCP server is currently in {% data variables.release-phases.public_preview %} and subject to change.
+> The remote {% data variables.product.github %} MCP server is currently in {% data variables.release-phases.public_preview %} and subject to change; use of the {% data variables.product.github %} MCP server locally is generally available (GA).
+>
+> While in {% data variables.release-phases.public_preview %}, access to the remote {% data variables.product.github %} MCP server through OAuth in {% data variables.product.prodname_copilot_short %} is governed by the {% data variables.product.prodname_copilot_short %} **Editor preview features** policy at the organization or enterprise level. PAT access to the server is managed by PAT policies.
 
 {% vscode %}