- Add missing :since: for NondecreasingIndentation and OverlappingInstances
- Remove duplicated descriptions for Safe Haskell flags and
  UndecidableInstances. Instead, the sections contain a link.
- compare-flags: Also check for options supported by ghci.
  This uncovered two more that are not documented.
  The flag -smp was removed.
- Formatting fixes
- Remove the warning about -XNoImplicitPrelude - it was written in 1996,
  the extension is no longer dangerous.
- Fix misspelled :reverse: flags

Fixes #18958.