chore: add uax15 to normative references

Signed-off-by: Wouter Termont <[email protected]>

Author: woutermont

protocol.html

@@ -1526,6 +1526,8 @@ <h3 property="schema:name">Normative References</h3>
                     <dd><a href="https://www.w3.org/TR/sparql11-query/" rel="cito:citesAsAuthority"><cite>SPARQL 1.1 Query</cite></a>. Steve Harris; Andy Seaborne; Eric Prud'hommeaux.  W3C. 21 March 2013. W3C Recommendation. URL: <a href="https://www.w3.org/TR/sparql11-query/">https://www.w3.org/TR/sparql11-query/</a></dd>
                     <dt id="bib-turtle">[Turtle]</dt>
                     <dd><a href="https://www.w3.org/TR/turtle/" rel="cito:citesAsAuthority"><cite>RDF 1.1 Turtle</cite></a>. Eric Prud'hommeaux; Gavin Carothers.  W3C. 25 February 2014. W3C Recommendation. URL: <a href="https://www.w3.org/TR/turtle/">https://www.w3.org/TR/turtle/</a></dd>
+                    <dt id="bib-uax15">[UAX15]</dt>
+                    <dd><a href="https://www.unicode.org/reports/tr15/" rel="cito:citesAsAuthority"><cite>Unicode normalization Forms</cite></a>. K. Whistler, Ed..  The Unicode Consortium. 12 August 2023. Unicode Standard Annex #15. URL: <a href="https://www.unicode.org/reports/tr15/">https://www.unicode.org/reports/tr15/</a></dd>
                     <dt id="bib-w3c-html">[W3C-HTML]</dt>
                     <dd><a href="https://www.w3.org/TR/html/" rel="cito:citesAsAuthority"><cite>HTML</cite></a>.  W3C. 28 January 2021. W3C Recommendation. URL: <a href="https://www.w3.org/TR/html/">https://www.w3.org/TR/html/</a></dd>
                     <dt id="bib-wac">[WAC]</dt>