added defn of knob MACHINE_RESOURCE_INVENTORY_<name>, which was omitted
from the documentation going back to  version 7.9.0.
===GT=== #2905
Merge branch 'V8_0_1-branch' into V8_0-branch
Merge branch 'V8_0-branch' into V8_1_0-branch
Merge branch 'V8_1_0-branch'