docs: sync README param names with #18/#19 renames

[Copilot]

README still referenced the pre-#18/19 parameter names (--group, group:) after those PRs renamed them to --groups / groups: (list format). Also aligns the runtime print label in ontrack.py with the documentation.

Changes

• Config example: group: your_group_name → groups:\n - your_group_name
• Config key table: group → groups; description updated to reflect list type and --groups override
• CLI options table: --group GROUP → --groups GROUP [GROUP ...]
• Operating Modes: command example and prose updated to --groups
• Example Output: label kept as Group : (describes an individual group value, not the parameter name)
• ontrack.py: print label changed from Groups : to Group : to match the documented example output

[dimalvovs]

I think lines 77 and 83 of README do not require changes, as these describe individual groups, not the groups parameter. looks good otherwise.

[Copilot]

I think lines 77 and 83 of README do not require changes, as these describe individual groups, not the groups parameter. looks good otherwise.

Reverted in e1ad133. Note that ontrack.py line 349 currently prints Groups : (changed in PR #18), so the example output is now slightly inconsistent with actual program output — let me know if you'd also like the code's print label adjusted.

[dimalvovs]

@copilot yes, please do also change the code's print label to match the documentation.

[Copilot]

@copilot yes, please do also change the code's print label to match the documentation.

Done in ea3ed1e — ontrack.py now prints Group : and the corresponding test assertions and docstrings have been updated to match.