upd texts of messages

Author: Anton-Latukha

src/Nix/Effects/Basic.hs

@@ -135,7 +135,7 @@ findPathBy finder l name = do
         $  "file '"
         ++ name
         ++ "' was not found in the Nix search path"
-        ++ " (add it using $NIX_PATH or -I)"
+        ++ " (add it's using $NIX_PATH or -I)"
     Just path -> return path
  where
   go :: Maybe FilePath -> NValue t f m -> m (Maybe FilePath)
@@ -165,7 +165,7 @@ findPathBy finder l name = do
         throwError
           $  ErrorCall
           $  "__nixPath must be a list of attr sets"
-          ++ " with 'path' elements, but saw: "
+          ++ " with 'path' elements, but received: "
           ++ show s
 
 fetchTarball

src/Nix/Value/Monad.hs

@@ -6,6 +6,6 @@ class MonadValue v m where
   defer :: m v -> m v
   demand :: v -> (v -> m r) -> m r
   -- | If 'v' is a thunk, 'inform' allows us to modify the action to be
-  --   peformed by the thunk, perhaps by enriching it with scpoe info, for
+  --   performed by the thunk, perhaps by enriching it with scope info, for
   --   example.
   inform :: v -> (m v -> m v) -> m v