Doc review: remove out of context description of shebang purposes

This doesn't seem to be the best place for this piece of information.
Let's remove it for now, and it may (or may not) have a place
somewhere else.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

docs/source/WritingTests.rst

@@ -238,28 +238,6 @@ The code example bellow uses :meth:`assertEqual
             self.log.debug("Verifying if this test is an instance of test.Test")
             self.assertIsInstance(self, test.Test)
 
-The reason why we have a shebang in the beginning of the test is because
-Avocado tests, similarly to unittests, can use an entry point, called
-:func:`avocado.main`, that calls avocado libs to look for test classes and execute
-its main entry point. This is an optional, but fairly handy feature. In case
-you want to use it, don't forget to ``chmod +x`` your test.
-
-Executing an Avocado test gives::
-
-    $ examples/tests/sleeptest.py
-    JOB ID    : de6c1e4c227c786dc4d926f6fca67cda34d96276
-    JOB LOG   : $HOME/avocado/job-results/job-2014-08-12T15.48-de6c1e4c/job.log
-    JOB HTML  : $HOME/avocado/job-results/job-2014-08-12T15.48-de6c1e4c/html/results.html
-    TESTS     : 1
-    (1/1) sleeptest.1: PASS (1.00 s)
-    PASS      : 1
-    ERROR     : 0
-    FAIL      : 0
-    SKIP      : 0
-    WARN      : 0
-    INTERRUPT : 0
-    TIME      : 1.00 s
-
 Running tests under other :mod:`unittest` runners
 -------------------------------------------------