message: Fix spelling errors and tweak some wording.
diff: @@ -20,11 +20,11 @@ the ideas above. For more sophisticated examples, refer to [Flex delegate](https
  ## Testing & Tooling
  -There are currently **two optionss** to plug in a newly created TFLite delegate
  +There are currently **two options** to plug in a newly created TFLite delegate
  to reuse existing TFLite kernel tests and and tooling:
  - Utilize the **[delegate registrar](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/lite/tools/delegates)**
  -mechansim
  +mechanism
  - Utilize the
  **[external delegate](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/lite/delegates/external)**
  mechanism.
  @@ -126,13 +126,13 @@ In this **alternative approach to reuse existing Tensorflow Lite kernel testing
  and tooling**, we first create an external delegate adaptor like the [`external_delegate_adaptor.cc`](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/lite/delegates/utils/dummy_delegate/external_delegate_adaptor.cc) here, and create the corresponding BUILD target
  to build a dynamic library.
  -Afterwards, one could build binaries or use pre-built ones that are linked with
  -the
  +Afterwards, one could build binaries or use pre-built ones to run with the
  +dummy delegate as long as the binary is linked with the
  [`external_delegate_provider`](https://github.com/tensorflow/tensorflow/blob/8c6f2d55762f3fc94f98fdd8b3c5d59ee1276dba/tensorflow/lite/tools/delegates/BUILD#L145-L159)
  library which supports command-line flags as described
  [here](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/lite/tools/delegates#external-delegate-provider).
  -Note this delegate provider has already been linked to existing testing and
  -tooling binaries.
  +Note this external delegate provider has already been linked to existing testing
  +and tooling binaries.
  For example, the following illustrates how to benchmark the dummy delegate here
  via this external-delegate approach. We could use similar commands for testing
  