XEP-0215: Fixed typo (SHUOLD -> SHOULD)

xep-0215.xml

@@ -377,7 +377,7 @@
 </section1>
 
 <section1 topic='Internationalization Considerations' anchor='i18n'>
-  <p>If the requesting entity includes an 'xml:lang' attribute with its request, the responding entity SHUOLD include appropriately internationalized text as the value of the 'name' attribute. No other attributes are human-readable.</p>
+  <p>If the requesting entity includes an 'xml:lang' attribute with its request, the responding entity SHOULD include appropriately internationalized text as the value of the 'name' attribute. No other attributes are human-readable.</p>
 </section1>
 
 <section1 topic='Security Considerations' anchor='security'>