Merge branch 'jk/remote-helper-object-format-option-fix'

The implementation and documentation of "object-format" option exchange between the Git itself and its remote helpers did not quite match, which has been corrected. * jk/remote-helper-object-format-option-fix: transport-helper: send "true" value for object-format option transport-helper: drop "object-format <algo>" option transport-helper: use write helpers more consistently