BIP 89, BIP 114 and BIP 441 use <ref>…</ref> footnotes but none of them contains a <references/> tag. GitHub's mediawiki renderer only emits the footnote bodies where that tag appears, so on the rendered pages the footnote text is missing and the [n] superscripts point at #cite_note-n anchors that do not exist (e.g. BIP 89's notes on lift_x, auxiliary randomness and blindsecnonce; BIP 441's five rationale notes).
This adds a Footnotes section with <references/> to BIP 89 and BIP 441 (before Acknowledgements/Thanks, matching BIP 340), and puts the tag under BIP 114's existing References section.
Rendering-only change, no text of the BIPs is modified, so no changelog entries were added; happy to add one for BIP 89 if preferred.