Fix non-canonical XMLLiteral in dataspace.ttl

Replace the numeric character reference → with the literal → so the
rdf:XMLLiteral is canonical XML. Jena 6 rejects entity references in
XMLLiteral lexical forms with "not valid for datatype XSD XMLLiteral".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: namedgraph

docs/reference/dataspace.ttl

@@ -67,7 +67,7 @@
             <h3 id="admin-apps">Administration</h3>
             <p>Every administration application is related to one <a href="#end-user-apps">end-user application</a>. It cannot exist standalone.</p>
             <p>The base URI of an administration application is the base URI of its end-user application with the <code>admin.</code> subdomain
-                prefixed to the host (e.g. <samp>https://example.com/</samp> &#8594; <samp>https://admin.example.com/</samp>). Because the admin application lives on
+                prefixed to the host (e.g. <samp>https://example.com/</samp> → <samp>https://admin.example.com/</samp>). Because the admin application lives on
                 its own subdomain (origin), it no longer occupies a path within the end-user application.</p>
             <div class="alert alert-info">
                 <p>Since LinkedDataHub 5.1.0 the administration application is served on the <code>admin.</code> subdomain rather than under an