Fix description of id field in GroupBaseInfo
Fix description of id field in GroupBaseInfo

This field contains the UUID of the group, not the numeric group ID of
Gerrit internal groups.

Change-Id: I1e258c224b97a767b16ce8d3631b41d4840ecb71
Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>

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