Removing some installation instructions
[#4608] Using #. for numbered bullets
Re-wording parameters.yml section and removing note about vendor #4608

The vendors was removed because we really need to keep this focused on svn
and not repeat ourselves and create duplicate docs
minor #4608 Removing some installation instructions (weaverryan)

This PR was merged into the 2.3 branch.

Discussion
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Removing some installation instructions

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | all
| Fixed tickets | n/a

Hi guys!

This removes some duplicate installation instructions. I want less docs, without explaining less :). Duplicate like this is an opportunity to give users more paths for no reason. I'm sure we have more things like this - like details on handling parameters.yml or other things.

Thanks!

Commits
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3395b50 Re-wording parameters.yml section and removing note about vendor #4608
9d925ff [#4608] Using #. for numbered bullets
78e08f4 Removing some installation instructions