[doc] Document Hard Line break in markdown syntax guide

[cderv]

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Description

From

If you need a hard line break, put two or more spaces at the end of a line.

[mcanouil]

It seems q2 does only support trailing \ for line breaks and not the trailing spaces syntax.
Is that intended? cc @cscheid

edit: sorry for the noise, I was not looking in pampa, only at the tree-sitter scanner which has only the backslash.

• https://github.com/quarto-dev/q2/blob/451cad45d063449f624043e13825f7587e4f98a9/crates/tree-sitter-qmd/tree-sitter-markdown/src/scanner

[cscheid]

You're correct: we're not going to support the two-space syntax in q2.

[mcanouil]

Ok, I'm updating the PR for this.