Fix missing code block in playbook variables doc

In yum module example, use present/absent instead of installed/removed

grammar fix

Fix small typographic error

A code sample was not being rendered as a code block. This adds the preceding '::' reStructuredText markup.

Fixes #7910

Allow group module to handle check_mode properly when group.state=present and group already exists

Add examples for `shell` and `command` modules.

Fix typo in playbook roles doc

Restore #6484 (YAML lists in apt) reverted by c7511688.

Arch PKGBUILD fixes : removes man3 section and adds contributor list

Fixes #7170

At the point the exception is handled, it is likely due to error loading
a sub-template included from main template. Besides file not found, it
can be caused also by include path failing Jinja2 checks. Now, when
rendering the exception from Jinja, it will include exception name. This
will give basic context or *what* the error is.

Fixes #7103
Fixes #7105

Allow 'make rpm' work from a release tarball

mysql_db module now correctly fails on import if bz2 or gz fails.

force evaluation of vars memory_mb, num_cpus to be int fixes #7903

Add os relpath filter

Merge branch 'bug/fix-health-check-to-zero-bug/7898' of https://github.com/botify-labs/ansible into botify-labs-bug/fix-health-check-to-zero-bug/7898

Check for empty os-release file, fixes #7885

Adding support for spot instances in ansible_lc.

Merge branch 'upgrade-release' of https://github.com/amenonsen/ansible into amenonsen-upgrade-release