Add ID parameter to collapse-content snippet (#28586)

Author: janine-c

snippets/markdown.json

@@ -306,8 +306,8 @@
 	"Collapse": {
 			"prefix": ";;collapse",
 			"body": [
-				"{{% collapse-content title=\"${1:title}\" level=\"${2|h4,h1,h2,h3,h5,p|}\" expanded=${3|false,true|} %}}",
-				"${4:...}",
+				"{{% collapse-content title=\"${1:title}\" level=\"${2|h4,h1,h2,h3,h5,p|}\" expanded=${3|false,true|} id=\"${4:id-for-anchoring}\" %}}",
+				"${5:...}",
 				"{{% /collapse-content %}}"
 			],
 			"description": "Collapse and expand content"