sharing: Unicode is a proper noun

rfc/src/sharing.xml

@@ -396,7 +396,7 @@ for this principal that the user has access to, or null if none.</t></li>
 
 <section anchor="spoofing"><name>Spoofing</name>
 <t>Allowing users to edit their own Principal's name (and, to a lesser extent, email, description, or type) could allow a user to change their Principal to look like another user in the system, potentially tricking others into sharing private data with them. Servers may choose to forbid this, and <bcp14>SHOULD</bcp14> keep logs of such changes to provide an audit trail.</t>
-<t>Note that simply forbidding the use of a name already in the system is insufficient protection, as a malicious user could still change their name to something easily confused with the existing name by using trivial misspellings or visually similar unicode characters.</t>
+<t>Note that simply forbidding the use of a name already in the system is insufficient protection, as a malicious user could still change their name to something easily confused with the existing name by using trivial misspellings or visually similar Unicode characters.</t>
 </section>
 
 <section anchor="unnoticed-sharing"><name>Unnoticed sharing</name>