Update feature_request.md

Remove unnecessary repetitive text

.github/ISSUE_TEMPLATE/feature_request.md

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 **Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is.
 
 **Describe the solution you'd like**
-A clear and concise description of what you want to happen.
 
 **Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
 
 **Additional context**
-Add any other context or screenshots about the feature request here.