added docs for commonly used region parameter in some ec2 modules

lib/ansible/utils/module_docs_fragments/ec2.py

@@ -0,0 +1,29 @@
+# (c) 2015, Ansible, Inc
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+
+class ModuleDocFragment(object):
+
+    # EC2 only documentation fragment
+    DOCUMENTATION = """
+options:
+    region:
+        description:
+          - The AWS region to use. If not specified then the value of the EC2_REGION environment variable, if any, is used. See U(http://docs.aws.amazon.com/general/latest/gr/rande.html#ec2_region)
+        required: false
+        aliases: [ 'aws_region', 'ec2_region' ]
+"""