update description

packages/remark-growi-plugin/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@growi/remark-growi-plugin",
   "version": "5.1.3-RC.0",
-  "description": "remark plugin to support GROWI plugin",
+  "description": "remark plugin to support GROWI plugin (forked from remark-directive@2.0.1)",
   "license": "MIT",
   "keywords": [
     "unified",