Fix comment typo in feature proposal issue template

What does this MR do?

Fix comment typo in feature proposal issue template

Does this MR meet the acceptance criteria?

• [ ] Changelog entry added, if necessary
• [ ] Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• [ ] Tests added for this feature/bug
• [ ] Tested in all supported browsers
• Conforms to the code review guidelines
• [ ] Conforms to the merge request performance guidelines
• [ ] Conforms to the style guides
• [ ] Conforms to the database guides
• ~~[ ] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process~~
• [ ] Security reports checked/validated by reviewer