Update configuring_rules.md

docs/pages/pmd/userdocs/configuring_rules.md

@@ -54,7 +54,7 @@ Properties are assigned a value with a `property` element, which should mention
 <property name="reportLevel" value="150"/>
 ```
 
-All property assignements must be enclosed in a `properties` element, which is itself inside a `rule` element.
+All property assignments must be enclosed in a `properties` element, which is itself inside a `rule` element.
 
 {%include tip.html content="The properties of a rule are documented with the rule, e.g. [here](pmd_rules_java_design.html#npathcomplexity) for NPathComplexity. Note that **assigning a value to a property that does not exist throws an error!**" %}