grammar fix
In the yum module example, use present/absent instead of installed/removed
Fix missing code block in playbook variables doc

A code sample was not being rendered as a code block. This adds the preceding '::' reStructuredText markup.
Change safe_eval to a strict white list
Fix small typographic error
Merge pull request #7935 from mscherer/patch-1

Fix small typographic error
Merge pull request #7928 from timruffles/grammar

grammar fix
Merge pull request #7931 from quiver/fix-yum-module-doc

In yum module example, use present/absent instead of installed/removed
Merge pull request #7934 from chrishepner/patch-1

Fix missing code block in playbook variables doc
Changed auth args in openstack modules
Changed wait to true/false in nova compute
Added region to nova keypair, fixed example
Fixes to glance image
Added nova security groups
Change keystone file name
Added cinder volume
Added nova snapshot
Nova compute option fixes
Added nova volume
Added swift container