(DOC-834) command line user management page should refer to rake tasks
in code font

This patch adds code formatting to several rake tasks names in the
console's command line user management documentation.

It also fixes a spacing problem that was present in two of the code
samples.

The patch is applied to the docs for PE 3.0, PE 3.1, and PE 3.2.
Merge branch 'fix_for_DOC-834' of https://github.com/llowder/puppet-docs into fix_for_DOC-834