Update notebook_op docstring

kfp_notebook/pipeline/_notebook_op.py

@@ -61,8 +61,10 @@ def __init__(self,
           cos_dependencies_archive: archive file name to get from object storage bucket e.g archive1.tar.gz
           pipeline_outputs: comma delimited list of files produced by the notebook
           pipeline_inputs: comma delimited list of files to be consumed/are required by the notebook
+          pipeline_envs: dictionary of environmental variables to set in the container prior to execution
           requirements_url: URL to a python requirements.txt file to be installed prior to running the notebook
           bootstrap_script_url: URL to a custom python bootstrap script to run
+          emptydir_volume_size: Size(GB) of the volume to create for the workspace when using CRIO container runtime
           kwargs: additional key value pairs to pass e.g. name, image, sidecars & is_exit_handler.
                   See Kubeflow pipelines ContainerOp definition for more parameters or how to use
                   https://kubeflow-pipelines.readthedocs.io/en/latest/source/kfp.dsl.html#kfp.dsl.ContainerOp