Fix linting issues in the news blurb

Author: miikka

Misc/NEWS.d/next/Library/2019-04-25-21-11-37.bpo-36461.TO5YyP.rst

@@ -1,4 +1,5 @@
 In timeit module:
-- added a new parameter *target_time* to ``timeit.timeit()`` and ``timeit.replace()`` methods and ``timeit.Timer()`` class;
-- had `timeit` and `repeat` methods (and functions) fall back 
-  on `autorange` if the number is set to 0 or None.
+- added a new parameter *target_time* to :func:`timeit.timeit` and
+  :func:`timeit.repeat` methods and :class:`timeit.Timer` class;
+- had ``timeit`` and ``repeat`` methods (and functions) fall back
+  on ``autorange`` if the number is set to 0 or None.