subcmds/sync.py: Fix typo in help

Change-Id: I70b63477241284249e395b8b0a220cb6f44f836b
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/270183
Reviewed-by: Mike Frysinger <vapier@google.com>
Reviewed-by: David Pursehouse <dpursehouse@digital.ai>
Tested-by: David Pursehouse <dpursehouse@digital.ai>

subcmds/sync.py

@@ -142,7 +142,7 @@ to halt syncing as soon as possible when the first project fails to sync.
 
 The --force-sync option can be used to overwrite existing git
 directories if they have previously been linked to a different
-object direcotry. WARNING: This may cause data to be lost since
+object directory. WARNING: This may cause data to be lost since
 refs may be removed when overwriting.
 
 The --force-remove-dirty option can be used to remove previously used