docs_pull_request: Add parameters highlighting

Added highlighting to parameter references in docs so that they standout a bit better.
Fix zfs create command for properties with spaces

If a property value contains one or more spaces, the zfs command will fail.
With value quoted this behavior is fixed.
pip module wasn't adding -e when using VCS
Update guide_aws.rst
Remove use_mirrors from pip module

PyPI moved to a CDN on 2013-05-26, so mirrors are now largely
unnecessary and pip removed the functionality in 1.5. More importantly
(and why I wrote this request): on 2014-02-15 the mirror directory was
taken offline, so mirrors may not work anymore even for pip versions
that support them.
Merge pull request #6054 from alanwill/patch-1

Update guide_aws.rst
Merge pull request #6051 from illenseer/devel

Fix zfs create command for properties with spaces
Merge pull request #6045 from garaden/pypi_mirrors_gone

Set use_mirrors default to "no" for the pip module
Merge pull request #6036 from mxxcon/patch-1

docs_pull_request: Add parameters highlighting