Merge branch 'kh/format-patch-noprefix-is-boolean'

The configuration variable format.noprefix did not behave as a proper boolean variable, which has now been fixed and documented. * kh/format-patch-noprefix-is-boolean: doc: diff-options.adoc: make *.noprefix split translatable doc: diff-options.adoc: show format.noprefix for format-patch format-patch: make format.noprefix a boolean