fixup! jun3/haskell: fix questions and add some new

Author: antonkalinin-ml

backend/junior-3/haskell.md

@@ -208,8 +208,8 @@
 * What is the function `deepseq` (and operator `$!!`)?
 * Could using `seq` change the returned value of the function?
 * In which way does runtime behavior of the following expressions differ?
-  * ``(a + b) `seq` ((a + b) : list)``
-  * ``let s = a + b in s `seq` (s : list)``
+  * ``a + b `seq` (a + b) : list``
+  * ``let s = a + b in s `seq` s : list``
 * What is the GHC extension `BangPatterns`?
   * Make examples when bang pattern is useless.
   * What form does the bang pattern force values to be calculated to?