gunixmounts: Clarify GUnixMountMonitor documentation and convert to gi-docgen linking syntax
See the commit messages for details — it’s definitely simplest if this MR is reviewed commit-by-commit.
Signed-off-by: Philip Withnall pwithnall@gnome.org
Fixes: #3569 (closed) Helps: #3250 Closes #3569 (closed)