Adding another xml test; spelling fixes

pkg/yqlib/xml_test.go

@@ -363,6 +363,13 @@ var xmlScenarios = []formatScenario{
 		expression:     ".zoo.animal |= ([] + .)",
 		expected:       "zoo:\n    animal:\n        - cat\n",
 	},
+	{
+		description:    "Parse xml: force all as an array",
+		subdescription: "Because of the way yq works, when updating everything you need to update the children before the parents. By default `..` will match parents first, so we reverse that before updating.",
+		input:          "<zoo><thing><frog>boing</frog></thing></zoo>",
+		expression:     "([..] | reverse | .[]) |= [] + .",
+		expected:       "- zoo:\n    - thing:\n        - frog:\n            - boing\n",
+	},
 	{
 		description:    "Parse xml: attributes",
 		subdescription: "Attributes are converted to fields, with the default attribute prefix '+'. Use '--xml-attribute-prefix` to set your own.",