Improve TraceNoLedgerView Haddock

It talks more about why we forecast in the forging loop instead of ticking.

But instead, the way more useful information about this message is what it implies: _something has gone wrong_ such that the node's chain is not growing anywhere nearly dense enough.

Locate the Haddock documentation for TraceNoLedgerView and read the current explanation. Revise it to explain that the message indicates something has gone wrong because the node's chain is not growing densely enough; done means the documentation emphasizes this implication rather than forecasting in the forging loop.

Written by the indexing model from the issue text.