fix typo (fix #1562)

src/ui/pages/help.html

@@ -1180,7 +1180,7 @@
 							<li><code>fractional-seconds-digits</code>: the number of fractional second digits (i.e.
 								"1" to "3")</li>
 							<li><code>time-zone-name</code>: the time zone name format (i.e. "short", "long",
-								"sortOffset", "longOffset", "shortGeneric", "longGeneric")</li>
+								"shortOffset", "longOffset", "shortGeneric", "longGeneric")</li>
 							<li><code>day-period</code>: the day period (i.e. "narrow", "short", "long")</li>
 							<li><code>era</code>: the era (i.e. "narrow", "short", "long")</li>
 							<li><code>locale-matcher</code>: the locale matcher (e.g. "lookup", "best fit")</li>