Adding versionadded to test skipping section of unittest documentation.

Doc/library/unittest.rst

@@ -11,9 +11,6 @@
 
 .. versionadded:: 2.1
 
-.. versionchanged:: 2.7
-   Added test :ref:`skipping and expected failures <unittest-skipping>`.
-
 The Python unit testing framework, sometimes referred to as "PyUnit," is a
 Python language version of JUnit, by Kent Beck and Erich Gamma. JUnit is, in
 turn, a Java version of Kent's Smalltalk testing framework.  Each is the de
@@ -498,6 +495,8 @@ automatically build :class:`unittest.TestSuite` instances from the existing
 Skipping tests and expected failures
 ------------------------------------
 
+.. versionadded:: 2.7
+
 Unittest supports skipping individual test methods and even whole classes of
 tests.  In addition, it supports marking a test as a "expected failure," a test
 that is broken and will fail, but shouldn't be counted as a failure on a