Correlated field docstrings

Lukas Scheel-Platzrequested to merge
correlated_field_docstrings into NIFTy_6

For #296 (closed), add docstrings to the most relevant CorrelatedFieldMaker methods.

Also rename the add_fluctuations parameter position_space -> target_subdomain.

@pfrank, @parras: Could you please fill in the #Fixmes and check whether I have described the operators behavior correctly?

Edited by Philipp Arras

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