Changelog final(?) edits

[loricooperhdf]

Cleaned up formatting, added links when available.

• ✅ Added attribution language
• @lrknox to do some organization (collect Cmake items, collect CVE fixes) IF time allows

@lrknox to help with organization
@brtnfld reminder to add attribution language

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Important

Refined CHANGELOG.md with improved formatting, added section links, and enhanced navigation.

• Formatting and Links:
  • Updated table of contents links in CHANGELOG.md for better navigation.
  • Added links to specific sections, e.g., bfloat16 predefined datatypes and complex numbers.
  • Changed macro EXTERNAL_HDF5_STATUS to lowercase for consistency.
  • Added backticks around code elements and paths for clarity.
• Miscellaneous:
  • Fixed typos and improved consistency in language and formatting.
  • Added GitHub issue links for bug fixes and security issues.

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[jhendersonHDF]

Another CVE issue to be updated with a link. If that's the standard going forward, more of these CVE issues will probably appear in entry titles from currently unmerged PRs that don't yet list them this way.

[loricooperhdf]

It was an editorial choice I made that perhaps I regret. Should I mention this to others to add the link? I can also keep an eye on this as code freeze approaches.

[jhendersonHDF]

I'd say it's worth bringing up. We can also do a last editing pass near to the release as well.