fix: FIT-1172: Anno Eval: Onboarding option is active even if 'manual task assignment' option is selected

[yyassi-heartex]

This pull request updates the documentation for project settings, specifically clarifying when certain annotator evaluation features are available and providing guidance on onboarding configuration.

Documentation clarifications and improvements:

• Added a note that Annotator Evaluation settings are only available when the project uses automatic task assignment, and clarified that these settings are not visible for manual distribution projects.
• Updated the onboarding section to clarify that setting the onboarding counter to zero will skip onboarding and only use continuous evaluation.

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[yyassi-heartex]

/git merge

Workflow run
Successfully merged: 5 files changed, 162 insertions(+), 29 deletions(-)