message: Update 6-to-7-change-summary.md
  a typo
diff: @@ -382,7 +382,7 @@ This document contains a detailed list of changes between RxJS 6.x and RxJS 7.x,
  ### zipWith, concatWith, mergeWith, raceWith
  -- Simply renamed versions of the operators `zip`, `concat`, `mergeWith`, and `race`. So we can deprecate those old names and use the new names without collisions.
  +- Simply renamed versions of the operators `zip`, `concat`, `merge`, and `race`. So we can deprecate those old names and use the new names without collisions.
  # module `rxjs/ajax`
  