Markdown Lint: Fix Issues
markdownLint.fix Auto-fix the safely-correctable Markdown lint issues (whitespace, headings, blank lines) in the active file.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Markdown Lint: Fix Issues, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.