REST: Fix sitelinks in OpenAPI Schema

Sitelink objects do not contain the `site` or `url` keys. Remove them from the schema and examples.

Change-Id: Iceb9c316c6248b1872d6c31efed62c40f16ee205

Author: outdooracorn

repo/rest-api/specs/global/response-parts.json

@@ -5,6 +5,11 @@
 			{
 				"required": [ "id", "type", "labels", "descriptions", "aliases", "statements", "sitelinks" ],
 				"properties": {
+					"sitelinks": {
+						"additionalProperties": {
+							"required": [ "title", "badges" ]
+						}
+					},
 					"statements": {
 						"additionalProperties": {
 							"items": { "$ref": "#/StatementResponseRequired" }

repo/rest-api/specs/global/schema-parts.json

@@ -6,16 +6,12 @@
 		},
 		"example": {
 			"afwiki": {
-				"site": "afwiki",
 				"title": "Douglas Adams",
-				"badges": [ "Q17437798" ],
-				"url": "https://af.wikipedia.org/wiki/Douglas_Adams"
+				"badges": [ "Q17437798" ]
 			},
 			"arwiki": {
-				"site": "arwiki",
 				"title": "دوغلاس آدمز",
-				"badges": [ ],
-				"url": "https://ar.wikipedia.org/wiki/%D8%AF%D9%88%D8%BA%D9%84%D8%A7%D8%B3_%D8%A2%D8%AF%D9%85%D8%B2"
+				"badges": [ ]
 			}
 		}
 	},

repo/rest-api/specs/global/schemas.json

@@ -73,9 +73,6 @@
 	"Sitelink": {
 		"type": "object",
 		"properties": {
-			"site": {
-				"type": "string"
-			},
 			"title": {
 				"type": "string"
 			},