bips 89/114/441: add missing Footnotes and references tag (#2289)

* bip-89, bip-114, bip-441: add missing <references/> tag

These three BIPs use <ref> footnotes but never place a <references/>
tag, so GitHub's mediawiki renderer drops the footnote text entirely and
the [n] superscripts link to anchors that do not exist.

Add a Footnotes section as well, so the notes are rendered.

---------

Co-authored-by: Kanan M <kanan@MacBook-Pro-Sanan.local>

bip-0089.mediawiki

@@ -399,6 +399,10 @@ You may also find example code of CCD in action [https://github.com/jurvis/chain
 * '''0.1.1''' (2025-11-30): Fix acknowledgments spelling, BIP3 formatting, and use "Chain Code" with a space throughout.
 * '''0.1.0''' (2025-10-14): Publication of draft BIP
 
+== Footnotes ==
+
+<references/>
+
 == Acknowledgements ==
 * Arik Sosman and Wilmer Paulino for the initial discussions and validation of this idea.  
 * Sanket Kajalkar, Jordan Mecom, Gregory Sanders, ZmnSCPxj, Yuval Kogman, and John Cantrell for code and design review.

bip-0114.mediawiki

@@ -374,5 +374,9 @@ uint256 ComputeMerkleRootFromBranch(const uint256& leaf, const std::vector<uint2
 == References ==
 *[[bip-0141.mediawiki|BIP141 Segregated Witness (Consensus layer)]]
 
+== Footnotes ==
+
+<references/>
+
 == Copyright ==
 This document is placed in the public domain.

bip-0441.mediawiki

@@ -653,6 +653,10 @@ Work in progress:
 * 0.2.0: 2025-02-21: change costs to match those in varops budget
 * 0.1.0: 2025-09-27: first public posting
 
+==Footnotes==
+
+<references/>
+
 ==Thanks==
 
 This BIP would not exist without the thoughtful contributions of coders who