export: Align docs of close(Rename/Reopen) methods

export: Align docs of close(Rename/Reopen) methods

The base implementation says it can accept an array with a single
element, but the subclasses only had `string` in the docblock (although
they could handle the array case). Hence, replace docblocks in
subclasses with @inheritDoc to copy the parent description and avoid
such discrepancies in the future.

Plus, change `array` to `string[]` for better type inference.

Change-Id: Ica9929fd50f31d8d5f0e29f7c60364086ea39ae5