[Bug] Documentation is confusing

[Alken0]

Version: 0.7.2
https://automl.github.io/ConfigSpace/main/guide.html

this is stated on the website:

conf = cs.sample_configuration()
conf['max_iter'] = 42
print(conf['max_iter'])
42

but it returns an error - I would have expected it to be possible, to just add a configuration to the config-space but it's only possible for already sampled configurations. This should be clearer written out and not just given indirectly through the code-example before.