dev: update feature_request.yml (#2168)

The tiniest tweak of the tiniest tweaks.

Author: AlekSi

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -6,7 +6,7 @@ body:
   - type: textarea
     id: problem
     attributes:
-      label: your feature request related to a problem? Please describe.
+      label: Your feature request related to a problem? Please describe.
       placeholder: "A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]"
     validations:
       required: true
@@ -30,7 +30,7 @@ body:
   - type: textarea
     id: additional
     attributes:
-      label: Additional context
+      label: Additional context.
       placeholder: "Add any other context or screenshots about the feature request here."
     validations:
       required: false