Fix faulty docstring in get_feature_definition endpoint
Description
The bad formatting of the docstring led to this issue: https://linear.app/unitelabs/issue/DEV-305/add-typing-to-python-sdk-connector-stubs#comment-bd834172
Furthermore, the formatting would result in a non-SiLA compliant xml feature definition and could result in strict clients to reject the sila-service feature.
Checklist
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