Resolve inconsistency in comments for style guide

[KyleKing]

The Style Guide indicate that a single # should be used, but then has examples with double #, which is confusing

https://github.com/KyleKing/docs/blame/89ba5ba2b1468f55bb77b9b7b1f418eb4af586fe/docs/guides/style/terraform-style-guide.md#L169-L171

Unless the ## -- is the intended guidance, I can also make that change

---

The changes look correct in deployment: https://6581f385a7bf9a0008663549--pensive-meitner-faaeee.netlify.app/guides/style/terraform-style-guide

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[KyleKing]

Just following up, does someone have time to take a look at this PR?

[KyleKing]

Just following up. This PR makes a minimal change to remove conflicting guidance in the style guide on block comments. Reviewing other code published by Gruntworks supports the change I've submitted here because the examples I found all use the single # --- syntax rather than ## ---.

Examples:

• https://github.com/gruntwork-io/terraform-aws-utilities/blob/a3217852061d0115dbbc2245bdb1abf8f4901574/modules/run-pex-as-data-source/main.tf#L1-L6
• https://github.com/gruntwork-io/terragrunt-infrastructure-modules-example/blob/776c82dc161be3be9303070628056df95ec2b907/asg-elb-service/main.tf#L1-L9

[KyleKing]

@yhakbar, as the most active contributor in the last month, could you review this PR or know who should review when you have a chance? Thanks!