Fix several it's/its errors in the documentation.

docsite/rst/community.rst

@@ -132,7 +132,7 @@ Modules are some of the easiest places to get started.
 Contributing Code (Features or Bugfixes)
 ----------------------------------------
 
-The Ansible project keeps it’s source on github at 
+The Ansible project keeps its source on github at 
 `github.com/ansible/ansible <http://github.com/ansible/ansible>`_ for the core application, and two sub repos ansible/ansible-modules-core and ansible/ansible-modules-extras for module related items.   If you need to know if a module is in 'core' or 'extras', consult the web documentation page for that module.
 
 The project takes contributions through

docsite/rst/developing_modules.rst

@@ -11,7 +11,7 @@ See :doc:`modules` for a list of various ones developed in core.
 Modules can be written in any language and are found in the path specified
 by `ANSIBLE_LIBRARY` or the ``--module-path`` command line option.
 
-By default, everything that ships with ansible is pulled from it's source tree, but
+By default, everything that ships with ansible is pulled from its source tree, but
 additional paths can be added.
 
 The directory "./library", alongside your top level playbooks, is also automatically

docsite/rst/guide_aws.rst

@@ -271,7 +271,7 @@ Example 4
 
     # Using the instanceid, call the ec2 module
     # locally to remove the instance by declaring
-    # it's state is "absent"
+    # its state is "absent"
 
     - hosts: ec2hosts
       gather_facts: True