Enhancing permissions table

[matthewshaver]

What are you changing in this pull request and why?

Enhancing the permissions tables:
Adding - to prepare for sortable tables
Adding superscript and footnotes to clarify default R permissions
Fixing spacing and reducing text

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."
• The content in this PR requires a dbt release note, so I added one to the release notes page.

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Name	Status	Preview	Updated (UTC)
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[runleonarun]

One small code issue but otherwise looks awesome!!

[runleonarun]

<br></br> is showing up as code in the header "Manage marketplace apps"

Suggested change

	| Account-level permission| Account Admin | Billing admin | Manage <br></br> marketplace <br></br> apps | Project creator | Security admin | Viewer |
	| Account-level permission| Account Admin | Billing admin | Manage <br></br> marketplace <br></br> apps | Project creator | Security admin | Viewer |

[runleonarun]

Approved for when you remove line breaks in heading!