updated the docs

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403367

docs/docs/other.xml

@@ -934,6 +934,8 @@
          From the command line you can choose to run all the installed tests, enable or disable the loggers, 
          set various logging levels, specify how many times to run the tests, or pick just one or two tests
          to run at a time rather than the entire suite.
+         The output of the program, that is, its return value from main() is the number of
+         failed tests.  So if every test succeeds then it returns 0.
       </p>
          </description>