Docs: Fixing subject-verb agreement (ArchipelagoMW#3491)

WebHostLib/templates/weightedOptions/macros.html

@@ -34,7 +34,7 @@
         Normal range: {{ option.range_start }} - {{ option.range_end }}
         {% if option.special_range_names %}
             <br /><br />
-            The following values has special meaning, and may fall outside the normal range.
+            The following values have special meanings, and may fall outside the normal range.
             <ul>
                 {% for name, value in option.special_range_names.items() %}
                     <li>{{ value }}: {{ name }}</li>