Trailing newlines are removed following markup

[mtoohey31]

• [x] I have tested with the master version of typstfmt and not just typst-lsp

Describe the bug

When formatting a document that ends in a normal paragraph, trailing newlines are removed. This doesn't appear to happen with other syntax elements, such as lists, headings, code blocks, etc.

To Reproduce

Format a document consisting of the following string: "_Glaciers_ form an important part of the earth's climate system.\n". After formatting, this produces: "_Glaciers_ form an important part of the earth's climate system." (note that the trailing newline is missing).