Docs syntax fixes

Subject: Fixing general things that did not translate properly between old docs and new docs | WEB-521
 
Description
===========
 
**Ticket**: https://saucedev.atlassian.net/browse/WEB-521
@ChrisWren 

#### Problem

Finding and fixing general things that did not translate properly between old docs and new docs

#### Solution

Got rid of "\"s that incorrectly replaced spaces from the old docs in markdown/reference/rest-api.md
Added a table that was missing in markdown/reference/sauce-connect.md
Corrected "sauceUsername" and "sauceAccessKey" in markdown/reference/test-configuration.md

#### Comments

There is a separate pull request to add scss for the table that this branch adds. (https://github.com/saucelabs/docs.saucelabs.com/pull/64)

#### Possible improvements


#### Checklist

- [ ] Is there any cruft that should be removed along with this code change? 
- [ ] Is that code change resulting in any SQL query changes to the database?
- [ ] Have you inspected queries that are run on the DB by the changed code? 
- [ ] Is that code change resulting in any performance changes to the application)?