Docs: fix broken links (#71911)
* Fix different broken links and missing pages
* Pin version in docs link for release announcements
* fixing validator error
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Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>
(cherry picked from commit 62c6e04d70)
Co-authored-by: Clément Duveau <clement@duveau.eu>