docs(gitlab): fix readme

Author: zhammer

plugins/gitlab-catalog-backend/README.md

@@ -1,6 +1,6 @@
 # @seatgeek/backstage-plugin-gitlab-catalog-backend
 
-This plugin offers catalog integrations for ingesting data from the Slack API into the Software Catalog.
+This plugin offers catalog integrations for ingesting data from gitlab API.
 
 [![npm latest version](https://img.shields.io/npm/v/@seatgeek/backstage-plugin-gitlab-catalog-backend/latest.svg)](https://www.npmjs.com/package/@seatgeek/backstage-plugin-gitlab-catalog-backend)