chore: use headings in bug report templates

[trivikr]

Issue #, if available:
N/A

Description of changes:
Uses headings in bug report templates instead of bold, so that templates can be organize contents in a hierarchy.

Bug report template with bold

Bug report template with headings

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-io]

Codecov Report

Merging #1967 (2a14c08) into master (f2a47e8) will increase coverage by 0.52%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1967      +/-   ##
==========================================
+ Coverage   79.30%   79.83%   +0.52%     
==========================================
  Files         368      368              
  Lines       15132    15553     +421     
  Branches     3222     3368     +146     
==========================================
+ Hits        12001    12417     +416     
- Misses       3131     3136       +5     

Impacted Files	Coverage Δ
packages/util-waiter/src/utils/validate.ts	81.81% <0.00%> (-18.19%)	⬇️
lib/storage/src/data-chunk/readable-helper.ts	86.84% <0.00%> (-5.47%)	⬇️
packages/s3-request-presigner/src/getSignedUrl.ts	92.85% <0.00%> (-2.98%)	⬇️
packages/util-dynamodb/src/convertToAttr.ts	98.70% <0.00%> (-1.30%)	⬇️
packages/util-waiter/src/poller.ts	100.00% <0.00%> (ø)
packages/util-waiter/src/waiter.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/endpoints.ts	81.48% <0.00%> (ø)
protocol_tests/aws-json/endpoints.ts	81.48% <0.00%> (ø)
protocol_tests/aws-query/endpoints.ts	81.48% <0.00%> (ø)
packages/util-dynamodb/src/marshall.ts	100.00% <0.00%> (ø)
... and 156 more

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 2a14c08
• Result: SUCCEEDED
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[github-actions]

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