[CORL-3159]: Change footer link text to Top of page

[kabeaty]

What does this PR do?

Updates the footer text for the Top of article link to say Top of page since that's more accurate.

These changes will impact:

• [x] commenters
• [ ] moderators
• [ ] admins
• [ ] developers

What changes to the GraphQL/Database Schema does this PR introduce?

none

Does this PR introduce any new environment variables or feature flags?

no

If any indexes were added, were they added to INDEXES.md?

n/a

How do I test this PR?

See that the link now says Top of page

Were any tests migrated to React Testing Library?

How do we deploy this PR?

[netlify[bot]]

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