In the example, you want /bin/true to be executed if the first command has an error return code. Combining command with && will run the second only if the first is successful. Combining them with ||, the second will be run only of the first fails, what is wanted here.

Fixes #2410

Adds note on python 3 incompatibility
Added note about ansible_python_interpreter for people having python3 as default interpreter (mainly Arch users ?)
Should fix #2344

Fixed typo in passlib URL link
Fixed style in cryp scheme list
Fixed bullet 7 in variable precedence section
Adds statement regarding passlib requirement

Added more details on encrypt usage for vars_prompt, including a list of
crypt schemes and a ling to the passlib documentation.

Added doc on encrypt capability of vars_prompt.
Assuming the example in https://github.com/ansible/ansible/blob/devel/examples/playbooks/prompts.yml is still valid.

Fixes #2280.