run codespell throughout fixing typos automagically

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "codespell -w",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

Database/Keys.hs

@@ -491,7 +491,7 @@ reconcileStaged dbisnew qh = ifM isBareRepo
 
 	-- How large is large? Too large and there will be a long
 	-- delay before the message is shown; too short and the message
-	-- will clutter things up unncessarily. It's uncommon for 1000
+	-- will clutter things up unnecessarily. It's uncommon for 1000
 	-- files to change in the index, and processing that many files
 	-- takes less than half a second, so that seems about right.
 	largediff :: Int