Update docs (ansible-collections#99)

* Update docs

Remove .git from repo url so links in readme will generate correctly
Add required ansible version
Run latest version of add_docs.py
Add version_added string to modules

* galaxy.yml was missing authors

This commit was initially merged in https://github.com/ansible-collections/community.aws
See: ansible-collections/community.aws@96ee268

Author: jillr

plugins/modules/ec2_placement_group.py

@@ -9,6 +9,7 @@
 DOCUMENTATION = '''
 ---
 module: ec2_placement_group
+version_added: 1.0.0
 short_description: Create or delete an EC2 Placement Group
 description:
     - Create an EC2 Placement Group; if the placement group already exists,

plugins/modules/ec2_placement_group_info.py

@@ -9,6 +9,7 @@
 DOCUMENTATION = '''
 ---
 module: ec2_placement_group_info
+version_added: 1.0.0
 short_description: List EC2 Placement Group(s) details
 description:
     - List details of EC2 Placement Group(s).