-s <strategy>::
--strategy=<strategy>::
- Use the given merge strategy; can be supplied more than
- once to specify them in the order they should be tried.
+ Use the given merge strategy.
If there is no `-s` option, a built-in list of strategies
is used instead ('git-merge-recursive' when merging a single
head, 'git-merge-octopus' otherwise). This implies --merge.