docs: fix EXAMPLES.md formatting and make all placeholders consistently prominent

Category A fixes from PR #88 triage (trivial fixes):

A1. Markdown Formatting:
- Add blank lines after all h3 headings for markdown consistency
- Fix blank lines around lists
- Remove trailing spaces
- Resolves: MD022, MD032, MD009 linting issues

A2. Consistent Placeholder Prominence:
- Replace 'company-terraform-state' → 'YOUR-TERRAFORM-STATE-BUCKET'
- Replace 'Z1234567890ABC' → 'YOUR-ROUTE53-ZONE-ID'
- Replace 'company.com' → 'YOUR-COMPANY.com'
- Replace 'company-cloudtrail' → 'YOUR-CLOUDTRAIL-BUCKET'
- Replace 'dev-cert/prod-cert/staging-cert' → 'YOUR-*-CERT-ID'
- Replace 'enterprise-cert' → 'YOUR-ENTERPRISE-CERT-ID'
- All placeholders now use consistent YOUR-* format

A3. Terraform Formatting:
- Verified all code blocks use correct 2-space indentation
- Format complies with terraform fmt standards

Addresses sir-sigurd's feedback:
- Comment 3.3: Formatting inconsistency (line 179)
- Comment 3.4: Inconsistent placeholder prominence (line 9)
- Comment 3.5: Indentation for terraform fmt (line 333)

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: drernie