Fix inconsistencies

02-hello-haskell/2.5-comprehension-check.md

@@ -1,4 +1,4 @@
-# Exercises: Comprhension check
+# Exercises: Comprehension check
 ## Exercise 1
 To declare these functions in the REPL, you need to prepend them with **let**.
 

02-hello-haskell/src/chapter.hs

@@ -1,11 +0,0 @@
--- 4
-waxOn = x * 5
-  where z = 7
-        x = y ^ 2
-        y = z + 8
-
--- 5
-triple x = x * 3
-
--- 6
-waxOff x = triple x

02-hello-haskell/src/chapter2.hs

@@ -36,3 +36,16 @@ bar x = pi * (x * x)
 x = 7
 y = 18
 f = x + y
+
+-- 2.11 Chpater Exercises
+-- 4
+waxOn = x * 5
+  where z = 7
+        x = y ^ 2
+        y = z + 8
+
+-- 5
+triple x = x * 3
+
+-- 6
+waxOff x = triple x

03-strings/3.11-chapter-exercises.md

@@ -2,7 +2,7 @@
 ## Reading syntax
 ### Excercise 1
 1. Correct
-2. Incorrect, should be:  `(++) [1,2,3] [4,5,6]
+2. Incorrect, should be:  `(++) [1,2,3] [4,5,6]`
 3. Correct
 4. Correct
 5. Incorrect, should be:  `"hello" !! 4`