release-notes: updates
release-notes: updates

- Avoid ambiguous language regarding when transactions confirm
- Elaborate on downgrading warning
- Other minor language improvements
- Clarify watch-only behaviour

Github-Pull: #5534

domob1812/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,Infernoman/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,domob1812/crowncoin,Infernoman/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,Crowndev/crowncoin