A few commands, including create_sibling_ria and foreach_dataset, are missing from python module reference

[mslw]

I noticed that these commands are not listed in the Python module reference of our online docs:

• create_sibling_ria
• export_archive_ora
• foreach_dataset
• shell_completion
• uninstall

uninstall has been removed in 85b9edf due to deprecation, and shell_completion has questionable value in Python API usage, but I feel that the first three (or even four) should be included - and aren't probably due to simple omission from the listing. The first three are listed under the methods of datalad.api.Dataset, but that table has no links to the method description.

I'll make a PR with the small change.

[yarikoptic-gitmate]

Issue fixed in 0.18.3