fast-element: Fix parameter name in a volatile decorator JSDoc

- Corrected parameter name in JSDoc for the `volatile` decorator.
- Replaced `@param name` with `@param descriptor` for accuracy.

packages/web-components/fast-element/src/observation/observable.ts

@@ -501,7 +501,7 @@ export function observable(target: {}, nameOrAccessor: string | Accessor): void
  * Decorator: Marks a property getter as having volatile observable dependencies.
  * @param target - The target that the property is defined on.
  * @param name - The property name.
- * @param name - The existing descriptor.
+ * @param descriptor - The existing descriptor.
  * @public
  */
 export function volatile(