Fix subtests documentation highlighting: remove misleading all-green 'u' output

Author: emilymamcarz

AUTHORS

@@ -151,6 +151,7 @@ Eli Boyarski
 Elizaveta Shashkova
 Éloi Rivard
 Emil Hjelm
+Emily Mamcarz
 Endre Galaczi
 Eric Hunsberger
 Eric Liu

doc/en/how-to/subtests.rst

@@ -26,10 +26,10 @@ Subtests are an alternative to parametrization, particularly useful when the exa
 
 Each assertion failure or error is caught by the context manager and reported individually:
 
-.. code-block:: pytest
+.. code-block:: console
 
     $ pytest -q test_subtest.py
-    uuuuuF                                                               [100%]
+    u u u u uF                                                           [100%]
     ================================= FAILURES =================================
     _______________________ test [custom message] (i=1) ________________________
 
@@ -61,14 +61,6 @@ Each assertion failure or error is caught by the context manager and reported in
     FAILED test_subtest.py::test - contains 2 failed subtests
     3 failed, 3 subtests passed in 0.12s
 
-In the output above:
-
-* Subtest failures are reported as ``SUBFAILED``.
-* Subtests are reported first and the "top-level" test is reported at the end on its own.
-
-Note that it is possible to use ``subtests`` multiple times in the same test, or even mix and match with normal assertions
-outside the ``subtests.test`` block:
-
 .. code-block:: python
 
     def test(subtests):