Improve a bit the 4.1 release notes [ci skip]

Fix a few typos. #present_in has been changed to #presence_in through
commit d61baee.

guides/source/4_1_release_notes.md

@@ -543,14 +543,15 @@ for detailed changes.
 * Make `touch` fire the `after_commit` and `after_rollback`
   callbacks. ([Pull Request](https://github.com/rails/rails/pull/12031))
 
-* Enable partial indexes for `sqlite >=
-  3.8.0`. ([Pull Request](https://github.com/rails/rails/pull/13350))
+* Enable partial indexes for `sqlite >= 3.8.0`.
+  ([Pull Request](https://github.com/rails/rails/pull/13350))
 
 * Make `change_column_null`
   revertable. ([Commit](https://github.com/rails/rails/commit/724509a9d5322ff502aefa90dd282ba33a281a96))
 
 * Added a flag to disable schema dump after migration. This is set to `false`
-  by defualt in the production environment for new applications. ([Pull Request](https://github.com/rails/rails/pull/13948))
+  by default in the production environment for new applications.
+  ([Pull Request](https://github.com/rails/rails/pull/13948))
 
 
 Active Model
@@ -709,7 +710,8 @@ for detailed changes.
   responsibilities within a
   class. ([Commit](https://github.com/rails/rails/commit/1eee0ca6de975b42524105a59e0521d18b38ab81))
 
-* Added `Object#present_in` to simplify value whitelisting. ([Commit](https://github.com/rails/rails/commit/4edca106daacc5a159289eae255207d160f22396))
+* Added `Object#presence_in` to simplify value whitelisting.
+  ([Commit](https://github.com/rails/rails/commit/4edca106daacc5a159289eae255207d160f22396))
 
 
 Credits