Tweak cheatsheet generation

- avoid the `smart` extension, as it turns `"` into smart quotes
- prevent line wrapping in output, to avoid a large diff with the
  existing HTML

Manual/Cheatsheet/Holmakefile

@@ -1,6 +1,6 @@
 CHEATSHEET_SOURCES = cheatsheet.md cheatsheet.css
 
 cheatsheet.html: $(CHEATSHEET_SOURCES)
-	pandoc -s --toc -c cheatsheet.css -o cheatsheet.html --from commonmark_x cheatsheet.md
+	pandoc -s --toc -c cheatsheet.css -o cheatsheet.html --from commonmark_x-smart --wrap=none cheatsheet.md
 
 EXTRA_CLEANS = cheatsheet.html