Corrected typo.

line.py

@@ -107,7 +107,7 @@ def generate_line(root):
                 if op == '*':
                     left, right = node
 
-                    # Get the previous multiplcation element if the arity is
+                    # Get the previous multiplication element if the arity is
                     # greater than 2
                     if left.title() == '*':
                         left = left[1]
@@ -130,7 +130,7 @@ def generate_line(root):
 
                 result += sep.join(e)
         else:
-            # Function
+            # Function call
             result = op + '(' + ', '.join(map(traverse, node)) + ')'
 
         return result