update the command buffer layer README for mutable dispatch (#64)

Author: bashbaug

layers/10_cmdbufemu/README.md

@@ -2,20 +2,20 @@
 
 ## Layer Purpose
 
-This is a layer that demonstrates how to emulate functionality - in this case, [cl_khr_command_buffer](https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#cl_khr_command_buffer) - using a layer.
-It works by intercepting calls to `clGetExtensionFunctionAddressForPlatform` to query function pointers for the `cl_khr_command_buffer` extension APIs.
-If a query succeeds by default then the layer does nothing and simply returned the queried function pointer as-is.
+This is a layer that demonstrates how to emulate functionality - in this case, the [cl_khr_command_buffer](https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#cl_khr_command_buffer) extension and the related [cl_khr_command_buffer_mutable_dispatch](https://registry.khronos.org/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#cl_khr_command_buffer_mutable_dispatch) extensions - using a layer.
+It works by intercepting calls to `clGetExtensionFunctionAddressForPlatform` to query function pointers for the `cl_khr_command_buffer` and `cl_khr_command_buffer_mutable_dispatch` extension APIs.
+If a query succeeds by default then the layer does nothing and simply returns the queried function pointer as-is.
 If the query is unsuccessful however, then the layer returns its own function pointer, which will record the contents of the command buffer for later playback.
 
-This command buffer emulation layer currently implements v0.9.0 of the `cl_khr_command_buffer` extension.
+This command buffer emulation layer currently implements v0.9.0 of the `cl_khr_command_buffer` extension and v0.9.0 of the `cl_khr_command_buffer_mutable_dispatch` extension.
 The functionality in this emulation layer is sufficient to run the command buffer samples in this repository.
 
-Please note that the emulated command buffers are intended to be functional, but unlike a native implementation of `cl_khr_command_buffer`, they may not provide any performance benefit over similar code without using command buffers.
+Please note that the emulated command buffers are intended to be functional, but unlike a native implementation, they may not provide any performance benefit over similar code without using command buffers.
 
 ## Layer Requirement
 
 Because this layer calls `clCloneKernel` when recording a command buffer it requires an OpenCL 2.1 or newer device.
-If an older device is detected then the layer will not advertise support for the `cl_khr_command_buffer` extension.
+If an older device is detected then the layer will not advertise support for the `cl_khr_command_buffer` or `cl_khr_command_buffer_mutable_dispatch` extensions.
 
 ## Key APIs and Concepts