Fix wording in changed modifier description in hx-trigger.md (#3219)

Update the description of the `changed` event modifier from "the event will only change" to "the event will only fire" to clarify that the modifier controls when the `change` event triggers, improving accuracy and readability. Addresses a potential documentation error.

Fixes #3218

Author: patricksuo

www/content/attributes/hx-trigger.md

@@ -56,7 +56,7 @@ for a global symbol with the name `foo`
 Standard events can also have modifiers that change how they behave.  The modifiers are:
 
 * `once` - the event will only trigger once (e.g. the first click)
-* `changed` - the event will only change if the value of the element has changed. Please pay attention `change` is the name of the event and `changed` is the name of the modifier.
+* `changed` - the event will only fire if the value of the element has changed. Please pay attention `change` is the name of the event and `changed` is the name of the modifier.
 * `delay:<timing declaration>` - a delay will occur before an event triggers a request.  If the event
 is seen again it will reset the delay.
 * `throttle:<timing declaration>` - a throttle will occur after an event triggers a request. If the event