Fix spelling mistake in documentation

docs/apache-airflow/core-concepts/params.rst

@@ -193,7 +193,7 @@ The following features are supported in the Trigger UI Form:
       If you add the attribute ``example`` with a list, a multi-value select option will be generated.
       If you add the attribute ``items``, a JSON entry field will be generated for more array types
       and additional type validation as described in
-      `JSON Schema Array Items<https://json-schema.org/understanding-json-schema/reference/array.html#items>`_.
+      `JSON Schema Array Items <https://json-schema.org/understanding-json-schema/reference/array.html#items>`_.
     - ``object``: Generates a JSON entry field
     - Note: Per default if you specify a type, a field will be made required with input - because of JSON validation.
       If you want to have a field value being added optional only, you must allow JSON schema validation allowing null values via: