Update reference-architecture-css.md

[smguilia]

Updates for formatting / fix sentence

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[smguilia]

Updates included:

1. The docs related to this DA moved into the security hub as part of platform simplification.
2. The indentions are to fix formatting issues as the page is not building correctly in the doc framework
3. I also proposed an update to the phrasing around SCC. The way it is in there now doesn't make sense to me. But, please read closely and be sure I didn't change anything that shouldn't be changed.

[ocofaigh]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

• GitHub release
• v2.1.0

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