dochelpers `[PY: PY]` macro handling cannot deal with `[]` in the conditional docs

[mih]

The datalad-next credentials command shows it in the CLI for its spec parameter. It fails to find the macro and leaves it in

[bpoldrack]

Looking into it.

Update: Seems like the regexes, both for CMD and PY, are explicitly not matching something that contains [, ] within. I guess, the intention is to not be greedy when matching.

And both directions are subject to it: alter_interface_docs_for_cmdline as well as alter_interface_docs_for_api.

[yarikoptic-gitmate]

Issue fixed in 0.17.10