Document `.name`

[pavithraes]

Explain .name in the Node or Graph concepts page. It allows you to rename a node, and differentiate a node that is used multiple times in a graph. Include an example with show_graph.

Add a note+link in the profiling page. It's useful for profiling specific instantiations of a node.

[timkpaine]

Also the argument for node/graph, and good to include how it looks in e.g. show_graph