Remove the "version" parameter from worker package transformation in TC documentation

# example of specifying a worker package in the transformation catalog
pegasus_worker = Transformation(
        "worker",
        namespace="pegasus",
        site="condorpool",
        pfn="https://download.pegasus.isi.edu/pegasus/4.8.0dev/pegasus-worker-4.8.0dev-x86_64_macos_10.tar.gz",
        is_stageable=True,
    )

Remove "version=1.0" for proper staging of the worker package.