Fixed error in version_added

SSIA
Suppressed output and updated documentation
Double quoted version_added in documentation
Examples must use "name" parameter instead of "guest" for virt module, both works though but code explicitly expects name as the guest VM identifier.
Chnge description as list inside string
Merge pull request #2535 from mavimo/documentation-description-formatting

Chnge description as list inside string
Merge pull request #2534 from victorcoder/devel

Examples must use "name" parameter instead of "guest" for virt module, b...
Merge pull request #2533 from mavimo/documentation-version_added

Double quoted version_added in documentation
Merge pull request #2531 from Afterburn/devel

Suppressed output and updated documentation
Merge pull request #2530 from mavimo/patch-1

Vagrant module - fixed version_added
Use aptitude safe-upgrade for apt upgrade=yes

Use aptitude safe-upgrade instead of apt-get upgrade to implement
apt: upgrade=yes. Using aptitude ensures that missing dependencies
will also be installed.

Fixes #2540
upgrade should obey check mode
Merge pull request #2541 from lorin/apt-upgrade

Use aptitude safe-upgrade for apt upgrade=yes
postgresql_user: fix docstrings

Change documentation of "state" param to refer to user (role) state instead of
database state.

Change 2 function docstrings to reflect the code
Merge pull request #2543 from b6d/postgresql_user-docfix

postgresql_user: fix docstrings