Merge branch 'ab/push-default-doc-fix' into maint

Doc fix. * ab/push-default-doc-fix: push: mention "push.default=tracking" in the documentation

Junio C Hamano committed Mar 24, 2017 at 12:57 UTC ce9e6178d31a61db05acd2c7311651d1da31d18f

No changes.