fixrules(ARIA landmark regions): Consistent ARIA landmark messages and help

[philljenkins]

Improve consistency of group and failure messages for the following ARIA "landmark region" related rules and help:

1. aria_application_label_unique + help*
2. aria_application_labelled + help*
3. aria_article_label_unique + help*
4. aria_banner_label_unique + help*
5. aria_banner_single + help*
6. aria_complementary_label_unique + help*
7. aria_complementary_label_visible + help*
8. aria_complementary_labelled
9. aria_content_in_landmark
10. aria_contentinfo_label_unique + help*
11. aria_contentinfo_misuse
12. aria_contentinfo_single
13. aria_document_label_unique + help*
14. aria_form_label_unique + help*
15. aria_landmark_name_unique + help*
16. aria_main_label_unique + help*
17. aria_main_label_visible + help*
18. aria_navigation_label_unique + help*
19. aria_parent_required
20. aria_region_label_unique + help*
21. aria_region_labelled + help*
22. aria_search_label_unique + help*
23. aria_toolbar_label_unique + help*

*updated help too

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

• Fixes ARIA landmark rule's messages consistency #1379
• see proposed changes in ARIA consistent messages.xlsx

Testing reference:

1. Open the latest Rule Listing file built in Actions, for example see Rule listing
2. Review the changes for the 23 rules listed above for text consistency, spelling, and changes as listed in ARIA consistent messages.xlsx

• Screenshots below come from the Rule listing artifact built in Actions
• Be sure to select the latest rules via the 7.3 ruleset to see all the latest rules:

• Most of the changes map to 2.4.1, so you'll find the most changes there
• check for consistency in messages, such as
  • Each element with ___ role ...
  • ... label that describes its purpose
  • Multiple elements with ___ role ...
    

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.

[philljenkins]

Updating messages in expected results files so automated build passes

[philljenkins]

@ErickRenteria this is the PR we discussed in the Standup/retro. Shunguo had review the text changes in the box/note and excel spreadsheet, so this PR is ready for review & approval and QA