Update puppet.vim

[rodesousa]

The best practices for puppet indentation files is 2 spaces.

source : https://docs.puppetlabs.com/guides/style_guide.html#spacing-indentation-and-whitespace

[igalic]

i'm fairly certain that most people use either https://github.com/rodjek/vim-puppet/
or have moved on to https://github.com/roidelapluie/vim-puppet

[puppetcla]

Waiting for CLA signature by @rodesousa

@rodesousa - We require a Contributor License Agreement (CLA) for people who contribute to Puppet, but we have an easy click-through license with instructions, which is available at https://cla.puppet.com/

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