Fixes from prior PRs

Author: bnmnetp

pretext/Lists/Exercises.ptx

@@ -168,7 +168,7 @@ myTests().main()
       <program xml:id="lst_q5_answer" language="python">
         <input>
 def max(lst):
-    max = 0
+    max = lst[0]
     for e in lst:
         if e &gt; max:
             max = e

pretext/Lists/ListMethods.ptx

@@ -27,7 +27,7 @@ print(mylist)
 mylist.sort()
 print(mylist)
 
-mylist.remove(5)            # Removes the first 12 in the list
+mylist.remove(5)            # Removes the second 12 in the list
 print(mylist)
 
 lastitem = mylist.pop()     # Removes and returns the last item of the list