Update playbook_best_practices.rst, range notation

[lvdh]

SUMMARY

Update --limit range notation.

Current notation triggers;

"[WARNING]: Use [x:y] inclusive subscripts instead of [x-y] which has been removed"

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

Best Practices document

ANSIBLE VERSION

ansible 2.3.1.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = Default w/o overrides
  python version = 2.7.12 (default, Nov 19 2016, 06:48:10) [GCC 5.4.0 20160609]

ADDITIONAL INFORMATION

Please comment if additional information is required.

[ansibot]

cc @dharmabumstead
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[lvdh]

Additionally, as per http://docs.ansible.com/ansible/intro_patterns.html ranges seem to use zero-based indices now. Is it safe to assume the Pattern rules apply to --limit as well? I would happily adjust the doc further if this is the case.

[dharmabumstead]

Thanks @lvdh!