All release notes should be consistent for BOM and LEs

[richlander]

Our model for JSON, markdown, and all other text formats should be:

• UTF8
• No BOM
• LF line-endings

We should ensure our linters enforce this.

[lbussell]

Related:

• .NET aggregate checksum files are formatted incorrectly #9958

[Frulfump]

I was surprised to see that the repo is missing an .editorconfig file setting those options that would help in some cases. I'd also expect indentation to be consistent i.e use only space and set the size to 2.