Add missing docstrings

Adding doc strings to `dofile`, `fromType`, and `pushList`.

src/Foreign/Lua/Api.hs

@@ -354,6 +354,7 @@ dostring s = do
     then pcall 0 multret Nothing
     else return loadRes
 
+-- | Loads and runs the given file.
 dofile :: FilePath -> Lua Status
 dofile fp = do
   loadRes <- loadfile fp

src/Foreign/Lua/Api/Types.hsc

@@ -138,6 +138,7 @@ instance Enum Type where
   fromEnum = fromIntegral . fromTypeCode . fromType
   toEnum = toType . TypeCode . fromIntegral
 
+-- | Convert a lua Type to a type code which can be passed to the C API.
 fromType :: Type -> TypeCode
 fromType tp = TypeCode $ case tp of
   TypeNone          -> #{const LUA_TNONE}

src/Foreign/Lua/Types/ToLuaStack.hs

@@ -97,6 +97,7 @@ instance ToLuaStack [Char] where
 instance ToLuaStack a => ToLuaStack [a] where
   push = pushList
 
+-- | Push list as numerically indexed table.
 pushList :: ToLuaStack a => [a] -> Lua ()
 pushList xs = do
   let setField i x = push x *> rawseti (-2) i