Fix documentation

Stranger6667 · Stranger6667 · commit 3fbf2e7a8021 · 2016-08-22T18:38:02.000+02:00
diff --git a/doc/en/writing_plugins.rst b/doc/en/writing_plugins.rst
@@ -293,7 +293,7 @@ can use like this::
                 pass
         """)
         result = testdir.runpytest("--verbose")
-        result.fnmatch_lines("""
+        result.stdout.fnmatch_lines("""
             test_example*
         """)
 
