ug_testing.rst: also mention checking the base suite results (CICE-Co…

…nsortium#934)

In the "End-To-End Testing Procedure" section of the user guide, we
instruct users to run a base suite and a test suite, but only mention
checking the results of the test suite.

Also mention checking the results of the base suite first, to make sure
everything passes before checking the test suite.

Suggested-by: Jean-Francois Lemieux <jean-francois.lemieux@canada.ca>

doc/source/user_guide/ug_testing.rst

@@ -1153,6 +1153,11 @@ Below is an example of a step-by-step procedure for testing a code change that m
 
   ./cice.setup -m onyx -e intel --suite base_suite --testid base0 --bgen cice.my.baseline
 
+  # Check the results
+
+  cd testsuite.base0
+  ./results.csh
+
   # Run the test suite with the new code
   # git clone the new code