Remove duplicated changelog entry and formatting fix

CHANGELOG.rst

@@ -161,8 +161,7 @@ time or change existing behaviors in order to make them less surprising/more use
   Thanks `@palaviv`_ for the complete PR (`#1474`_).
 
 * Now pytest warnings summary is shown up by default. Added a new flag
-  ``--disable-pytest-warnings`` to explicitly disable the warnings summary.
-  This change resolves the (`#1668`_).
+  ``--disable-pytest-warnings`` to explicitly disable the warnings summary (`#1668`_).
 
 * Make ImportError during collection more explicit by reminding
   the user to check the name of the test module/package(s) (`#1426`_).
@@ -220,8 +219,6 @@ time or change existing behaviors in order to make them less surprising/more use
 * Fix internal error issue when the ``method`` argument is missing for
   ``teardown_method()`` (`#1605`_).
 
-* Renamed the pytest ``pdb`` module (plugin) into ``debugging``.
-
 * Fix exception visualization in case the current working directory (CWD) gets
   deleted during testing (`#1235`_). Thanks `@bukzor`_ for reporting. PR by
   `@marscher`_.