Update feature_request.md

[lorensr]

• Comment out instructions so that submitter doesn't need to delete them (matches https://github.com/temporalio/.github/edit/main/.github/ISSUE_TEMPLATE/feature_request.md)
• Change sections to h2s so they're easier to read. Current:

h2s:

I also tried h3s, which I found clearer than bold, but not as clear as h2s.

[vercel]

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[cypress]

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Test summary

67 • 0 • 0 • 0

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Run details

Project	Temporal UI
Status	Passed
Commit	0aa61f4cc8 ℹ️
Started	Sep 16, 2022 3:26 AM
Ended	Sep 16, 2022 3:30 AM
Duration	03:36 💡
OS	Linux Ubuntu - 20.04
Browser	Chrome 105

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