Add correct credential docs

credentials/HttpBinApi.credentials.ts

@@ -8,7 +8,7 @@ import {
 export class HttpBinApi implements ICredentialType {
 	name = 'httpbinApi';
 	displayName = 'HttpBin API';
-	documentationUrl = 'httpbin';
+	documentationUrl = 'http://httpbin.org/#/Auth/get_bearer';
 	properties: INodeProperties[] = [
 		{
 			displayName: 'Token',

nodes/HttpBin/HttpBin.node.json

@@ -6,12 +6,12 @@
 	"resources": {
 		"credentialDocumentation": [
 			{
-				"url": "https://docs.n8n.io/credentials/httpbin"
+				"url": "http://httpbin.org/#/Auth/get_bearer"
 			}
 		],
 		"primaryDocumentation": [
 			{
-				"url": "https://docs.n8n.io/nodes/n8n-nodes-base.httpbin/"
+				"url": "http://httpbin.org/"
 			}
 		]
 	}