bad formatting with link checking and soft wraps

[bwplotka]

For some reasons $(MDOX) fmt --soft-wraps --links.validate --links.validate.config-file=.github/.mdox.validator.yaml $(MD_FILES_TO_FORMAT) will format following content:

For the existing proposals, we propose to rename existing proposal's file to have its PROM-<number> (based on their initial PRs), but leave the old files with a link to a new file, so the old links work.

to:

For the existing proposals, we propose to rename existing proposal's file to have its PROM-

<number>

(based on their initial PRs), but leave the old files with a link to a new file, so the old links work.

Let's fix it.