Fix documentation.

1. Fix documentation for Operand::numberOfConsumers.
2. Fix typos.

Bug: 69055733
Bug: 76016141
Bug: 74111771

Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksV1_0TargetTest --hal_service_instance=android.hardware.neuralnetworks@1.0::IDevice/sample-all
Test: VtsHalNeuralnetworksV1_1TargetTest --hal_service_instance=android.hardware.neuralnetworks@1.1::IDevice/sample-all

Change-Id: Ib3d5bbfa701070597731992c3867f72d7b0280bd