Cleanup CHANGELOGs [ci skip]

* Remove trailing spaces.
* Add backticks around method and command.
* Fix indentation.

actioncable/CHANGELOG.md

@@ -4,4 +4,5 @@
 
     *Edward Poot*
 
+
 Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/actioncable/CHANGELOG.md) for previous changes.

actionpack/CHANGELOG.md

@@ -10,4 +10,5 @@
 
     *Julian Nadeau*
 
+
 Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/actionpack/CHANGELOG.md) for previous changes.

actionview/CHANGELOG.md

@@ -1,6 +1,7 @@
-*   Update distance_of_time_in_words helper to display better error messages
+*   Update `distance_of_time_in_words` helper to display better error messages
     for bad input.
 
     *Jay Hayes*
 
+
 Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/actionview/CHANGELOG.md) for previous changes.

activejob/CHANGELOG.md

@@ -4,4 +4,5 @@
 
     *Steven Bull*
 
+
 Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/activejob/CHANGELOG.md) for previous changes.

activerecord/CHANGELOG.md

@@ -1,4 +1,4 @@
-*   Quote database name in db:create grant statement (when database_user does not have access to create the database).
+*   Quote database name in `db:create` grant statement (when database user does not have access to create the database).
 
     *Rune Philosof*
 

activesupport/CHANGELOG.md

@@ -18,4 +18,5 @@
 
     *Josh Pencheon*
 
+
 Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/activesupport/CHANGELOG.md) for previous changes.

railties/CHANGELOG.md

@@ -8,5 +8,4 @@
     *Jan Krutisch*
 
 
-
 Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/railties/CHANGELOG.md) for previous changes.