Update Style Guide references

[rnelson0]

The updated style guide has been released at https://docs.puppet.com/puppet/latest/style_guide.html. This is a change in URL and any existing check->style guide references are now incorrect.

[binford2k]

The old URL redirects to the new. https://docs.puppet.com/guides/style_guide.html. (we should still fix it, but it's not critical)

[ashemedai]

The top URL works for me, the bottom one 404s.