Fix typo in Manual.md
Fix typo in Manual.md

mappu/restic,restic/restic,middelink/restic,byo/restic,middelink/restic,kurin/restic,jayme-github/restic,fawick/restic,jayme-github/restic,restic/restic,ar-jan/restic,kurin/restic,stuertz/restic,byo/restic,ckemper67/restic,arithmetric/restic,ar-jan/restic,stuertz/restic,fawick/restic