Merge branch 'bw/config-refer-to-gitsubmodules-doc'

Docfix. * bw/config-refer-to-gitsubmodules-doc: docs: link to gitsubmodules

Junio C Hamano committed Jul 18, 2018 at 12:20 UTC a4d4427bc6c9acefe7803d204b4bdca3cd4059a0

No changes.