Update HttpBinApi.credentials.ts

Replace the docs URL. We need to be clear that the URL must point to their site. The automatic linking won't work as obviously we won't have official docs for community nodes.

credentials/HttpBinApi.credentials.ts

@@ -8,7 +8,7 @@ import {
 export class HttpBinApi implements ICredentialType {
 	name = 'httpbinApi';
 	displayName = 'HttpBin API';
-	documentationUrl = 'httpbin';
+	documentationUrl = '<your-docs-url>';
 	properties: INodeProperties[] = [
 		{
 			displayName: 'Token',