fix(table): remove aria-pressed from table headings

[saiponnada]

Fixes #2484

• This PR contains CSS changes
• This PR does not contain CSS changes

Description

• Removed aria-pressed references in the docs code as the attribute is inappropriate to denote multiple states of sort.

Checklist

• I verify the build is in a non-broken state
• I verify all changes are within scope of the linked issue

• I regenerated all CSS files under dist folder
• I tested the UI in all supported browsers
• I did a visual regression check of the components impacted by doing a Percy build and approved the build
• I tested the UI in dark mode and RTL mode
• I added/updated/removed Storybook coverage as appropriate

[ArtBlue]

Looks good!