Toc uses currentTiddler as "tag" default parameter if it is missing

[pmario]

This PR fixes #8289

• 8289

• The Toc uses currentTiddler as "tag" default parameter if it is missing.

• A little bit of docs changes.

@springerspandrel can you please test the prview, once it's built.

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Name	Status	Preview	Updated (UTC)
tiddlywiki5	✅ Ready (Inspect)	Visit Preview	Jun 24, 2024 2:23pm