Merge branch 'pb/strbuf-read-file-doc' into maint

Minor doc update. * pb/strbuf-read-file-doc: strbuf: describe the return value of strbuf_read_file

Junio C Hamano committed Jul 6, 2016 at 13:06 UTC f7927316cf7b6252e27e54cdd2929039253c2422

No changes.