Merge branch 'jn/update-contrib-example-merge'
* jn/update-contrib-example-merge: (24 commits)
merge script: learn --[no-]rerere-autoupdate
merge script: notice @{-1} shorthand
merge script: handle --no-ff --no-commit correctly
merge script: --ff-only to disallow true merge
merge script: handle many-way octopus
merge script: handle -m --log correctly
merge script: forbid merge -s index
merge script: allow custom strategies
merge script: merge -X<option>
merge script: improve log message subject
merge script: refuse to merge during merge
merge script: tweak unmerged files message to match builtin
merge script: --squash, --ff from unborn branch are errors
fmt-merge-msg -m to override merge title
merge-base --independent to print reduced parent list in a merge
merge-base --octopus to mimic show-branch --merge-base
Documentation: add a SEE ALSO section for merge-base
t6200 (fmt-merge-msg): style nitpicks
t6010 (merge-base): modernize style
t7600 (merge): test merge from branch yet to be born
...