Updated readme.html & wp-admin/about.php

[GeorgiosDrivas]

I have added title attributes and alt attributes to all img and a tags in the wp-admin/about.php and wp-admin/readme.html files

Trac ticket: https://core.trac.wordpress.org/ticket/59962#ticket

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

Hi @GiorgosDrivas! 👋

Thank you for your contribution to WordPress! 💖

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