[gsac] Remove comment that doesn't make sense any more

Ignore-this: 754650c6acc9ffc0b10f04920260b7dd

darcs-hash:20130707024145-2809a-de67942ea7a9f231aad495b23400deaf9eb1bbb7
[gsac] gsac.prefix.get skeleton

Ignore-this: 713fb1aa3b513069731fa0fb1b59ad31

darcs-hash:20130707024651-2809a-33efc2b64ac9f1ec74266703363ae58bbb7267cc
[gsac] Use gsac.prefix.get for 'get' in prefix.typecheck / topsort phase

Ignore-this: bb97be3dae9dada990f9575e3c9f225e

darcs-hash:20130707024703-2809a-3e0d12a4faa884492395e20392aa750728f85559
[gsac] Fill out gsac.prefix.get

Ignore-this: 88942e83d9c1bf924a8f68f85474feb3

darcs-hash:20130707024914-2809a-e28b6373c12b8f94df68abf6905bd84a773d2c29
[gsac] gsac.prefix.item.name skeleton

Ignore-this: 6f4039f5af8f4847c1c47bb8d761fc59

darcs-hash:20130707030503-2809a-98c51f77b09435bbbf25f1a19efa015845e868c7