Merge pull request #1842 from Stranger6667/doc-fix

Fix documentation

Author: nicoddemus

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*
         """)