[doc] Handle robocopy exit codes
[doc] Handle robocopy exit codes

Robocopy uses exit codes 0-7 to convey details about what was copied.
Exit code 8 starts the range of errors.

Only fail if robocopy exits with a value greater than or equal to 8.
Microsoft/bond,Microsoft/bond,chwarr/bond,Microsoft/bond,chwarr/bond,chwarr/bond,chwarr/bond,chwarr/bond,Microsoft/bond,Microsoft/bond,chwarr/bond,Microsoft/bond