Use correct info string in fenced code blocks

[crawford]

sh was being used where console was more appropriate; the former being for shell scripts and the latter for console interaction. I also cleaned up a set of commands in the Vault documentation to make copying-and-pasting easier and fixed the formatting of some IAM policies.

[crawford]

@robszumski fixed. That was because the indentation was four spaces, which is also the cutoff for a code block, so I think it was confusing the renderer. I knocked it down to three spaces to match the parent section.