fix(extension): Update Settings screenshots and text in User and Quick Guides for v7.3 support

[philljenkins]

Extension UI bug because of changes to support v 7.3 and WCAG 2.2

• User Guide screenshots & text
• Quick Guide screenshots & text

This PR is related to the following issue(s):

• Fixes Update screenshots in User Guide with new IBM v7.3 images #1922

Testing reference:

1. Display the ["User Guide"
   • see chrome-extension://fekkcnekanncpoahpkhkkajokmooalfn/usingAC.html#t_select_settings
   • review section 5. Settings for formatting and valid links
2. Display the "Quick Guide"
   • see chrome-extension://fekkcnekanncpoahpkhkkajokmooalfn/quickGuideAC.html#settings
   • review section 8. Settings for formatting and valid links

I have conducted the following for this PR:

• I validated this code in Chrome and FF
• I validated this fix in my local env
• I provided details for testing
• This PR has been reviewed and is ready for test
• I understand that the title of this PR will be used for the next release notes.

[ErickRenteria]

Good to go