Update api/opencl_runtime_layer.asciidoc

Co-authored-by: Ben Ashbaugh <[email protected]>

api/opencl_runtime_layer.asciidoc

@@ -2092,7 +2092,7 @@ ifdef::cl_ext_image_from_buffer[]
     buffer.
   * {CL_INVALID_IMAGE_SIZE} if the {cl_ext_image_from_buffer_EXT} extension is
     supported and an image is created from a buffer and the buffer passed in
-    _image_desc->_mem_object_ is too small to be used as a data store for the
+    __image_desc__->__mem_object__ is too small to be used as a data store for the
     image, e.g. if its size is smaller than the value returned for
     {CL_IMAGE_REQUIREMENTS_SIZE_EXT} for the parameters used to create the image.
 endif::cl_ext_image_from_buffer[]