adjust default values with more information

Signed-off-by: Maia Iyer <maia.raj.iyer@gmail.com>

Author: maia-iyer

mcp/github_tool/.env.template

@@ -1,5 +1,5 @@
 UPSTREAM_MCP = "https://api.githubcopilot.com/mcp/"
 REQUIRED_SCOPE = "github-full-access"
-INIT_AUTH_HEADER = "Bearer <PAT>"
-UPSTREAM_HEADER_TO_USE_IF_IN_AUDIENCE = "Bearer <PAT>"
-UPSTREAM_HEADER_TO_USE_IF_NOT_IN_AUDIENCE = "Bearer <PAT>"
+INIT_AUTH_HEADER = "Bearer <PRIVILEGED_ACCESS_PAT>"
+UPSTREAM_HEADER_TO_USE_IF_IN_AUDIENCE = "Bearer <PRIVILEGED_ACCESS_PAT>"
+UPSTREAM_HEADER_TO_USE_IF_NOT_IN_AUDIENCE = "Bearer <PUBLIC_ACCESS_PAT>"