message: docs(migration): fix link to deprecated methods
  Fix broken page link to deprecated methods in migration guide
diff: @@ -24,7 +24,7 @@ npm i -g rxjs-tslint
  rxjs-5-to-6-migrate -p [path/to/tsconfig.json]
  ```
  -5. Before RxJS release v7, you will need to remove and replace all use of [deprecated functionality](#deprecated).
  +5. Before RxJS release v7, you will need to remove and replace all use of [deprecated functionality](#deprecations).
  ## Backwards compatibility
  