pytest: Shorten traceback length by default

This produces a lot of code output which is not very helpful and is quite
annoying to wade through. Use the short format by default.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/develop/py_testing.rst b/doc/develop/py_testing.rst
index 4f1e1f6..52238ca 100644
--- a/doc/develop/py_testing.rst
+++ b/doc/develop/py_testing.rst
@@ -103,6 +103,13 @@
 browser, but may be read directly as plain text, perhaps with the aid of the
 `html2text` utility.
 
+Controlling output
+~~~~~~~~~~~~~~~~~~
+
+By default a short backtrace is reported. If you would like a longer one,
+pass ``--tb=long`` when running the test. See the pytest documentation for
+more options.
+
 Running tests in parallel
 ~~~~~~~~~~~~~~~~~~~~~~~~~