TFNodeContext.cluster_spec documentation

[superbobry]

I think there is an inconsistency in TFNodeContext documentation:

TensorFlowOnSpark/tensorflowonspark/TFSparkNode.py

Line 36 in 94c8142

:cluster_spec: tf.train.ClusterSpec

The actual value of cluster_spec is a dictionary of the same shape as the one passed to tf.train.ClusterSpec constructor, but it isn't a ClusterSpec. Is this a mistake on the documentation side or rather on the implementation?

[leewyang]

Good catch! It's actually just a documentation error... I'll update the docs.

[leewyang]

Bundled it into #221