message: Update .gitlab/issue_templates/Feature Request.md
diff: **NOTE:** If there are any GitLab issues which prevent this issue from being started/completed, link them as `is blocked by`.
  -## Feature in Roadmap
  +## Feature Request
  **User Story**
  - A clear but concise requirement definition from **an user perspetive**. An user can be a customer, a team member, MLPerf team, another Merlin component, etc. Make the story independent and small if possible while specifying the **problem** and **goal** clearly.
  - Example 1. As our customer XX and YY put their data in HDFS, I will extend the HugeCTR DataReader to load the HDFS-resident dataset.
  