tests: test_help cosmetics

Adjust some comments and remove parentheses (which are unnecessary in
assert statements in Python).

Signed-off-by: Marti Bolivar <marti.bolivar@nordicsemi.no>

tests/test_help.py

@@ -5,14 +5,16 @@
 from west.main import BUILTIN_COMMAND_NAMES
 from conftest import cmd
 
-def test_help(west_init_tmpdir):
-    # Check that output from help is equivalent to -h
+def test_help_and_dash_h(west_init_tmpdir):
+    # Test "west help" and "west -h" are the same.
 
     h1out = cmd('help')
     h2out = cmd('-h')
-    assert(h1out == h2out)
+    assert h1out == h2out
 
+    # Test "west help <command>" and "west <command> -h" for built-in
+    # commands.
     for c in BUILTIN_COMMAND_NAMES:
         h1out = cmd('help {}'.format(c))
         h2out = cmd('{} -h'.format(c))
-        assert(h1out == h2out)
+        assert h1out == h2out