Fix a few remaining problems found by rstlint.
diff --git a/Doc/tutorial/classes.rst b/Doc/tutorial/classes.rst
index d6842e0..7d106fc 100644
--- a/Doc/tutorial/classes.rst
+++ b/Doc/tutorial/classes.rst
@@ -789,7 +789,7 @@
    f
    l
    o
-   g	
+   g
 
 Anything that can be done with generators can also be done with class based
 iterators as described in the previous section.  What makes generators so
diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst
index 454472c..75163d0 100644
--- a/Doc/tutorial/datastructures.rst
+++ b/Doc/tutorial/datastructures.rst
@@ -519,7 +519,7 @@
    >>> answers = ['lancelot', 'the holy grail', 'blue']
    >>> for q, a in zip(questions, answers):
    ...     print('What is your {0}?  It is {1}.'.format(q, a))
-   ...	
+   ...
    What is your name?  It is lancelot.
    What is your quest?  It is the holy grail.
    What is your favorite color?  It is blue.
@@ -542,7 +542,7 @@
    >>> basket = ['apple', 'orange', 'apple', 'pear', 'orange', 'banana']
    >>> for f in sorted(set(basket)):
    ...     print(f)
-   ... 	
+   ...
    apple
    banana
    orange