[html2] Support oneOf (#18642)

Author: Aniokrait

modules/openapi-generator/src/main/resources/htmlDocs2/js_jsonschemaview.mustache

@@ -133,7 +133,7 @@ var JSONSchemaView = (function () {
     // Determine if a schema is an array
     this.isArray = !this.isAny && this.schema && this.schema.type === 'array';
 
-    this.isObject = this.schema && (this.schema.type === 'object' || this.schema.properties || this.schema.anyOf || this.schema.oneof || this.schema.allOf);
+    this.isObject = this.schema && (this.schema.type === 'object' || this.schema.properties || this.schema.anyOf || this.schema.oneOf || this.schema.allOf);
 
     // Determine if a schema is a primitive
     this.isPrimitive = !this.isAny && !this.isArray && !this.isObject;