fix the team code review comments

Author: caberos

SoftLayer/CLI/firewall/list.py

@@ -70,7 +70,7 @@ def cli(env):
                              'hardwareId')
             ])
 
-    table_gatewalls = formatting.Table(['firewall id',
+    table_gatewalls = formatting.Table(['Id',
                                         'firewall',
                                         'type',
                                         'Hostname',

SoftLayer/managers/firewall.py

@@ -304,9 +304,9 @@ def get_instance(self, firewall_id, mask=None):
         return svc.getObject(id=firewall_id, mask=mask)
 
     def get_firewalls_gatewalls(self):
-        """Returns a list of all firewalls on the account.
+        """Returns a list of all gateway firewalls (gatewalls) on the account.
 
-        returns: A list of firewalls on the current account.
+        returns: A list of gateway firewalls (gatewalls) on the current account.
         """
         mask = 'mask[id,networkSpace,name,' \
                'networkFirewall[id,firewallType,datacenter[name]],' \