formatting pass over CHANGELOGs. [ci skip]

actionpack/CHANGELOG.md

@@ -30,7 +30,7 @@
 
     *Josef Šimánek*
 
-*   Remove `ActionController::HideActions`
+*   Remove `ActionController::HideActions`.
 
     *Ravil Bayramgalin*
 

activejob/CHANGELOG.md

 *   Add `:only` option to `assert_enqueued_jobs`, to check the number of times
-    a specific kind of job is enqueued:
+    a specific kind of job is enqueued.
+
+    Example:
 
         def test_logging_job
           assert_enqueued_jobs 1, only: LoggingJob do
@@ -14,7 +16,9 @@
 
     Since `ActiveJob::Base#deserialize` can be overridden by subclasses (like
     `ActiveJob::Base#serialize`) this allows jobs to attach arbitrary metadata
-    when they get serialized and read it back when they get performed. Example:
+    when they get serialized and read it back when they get performed.
+
+    Example:
 
         class DeliverWebhookJob < ActiveJob::Base
           def serialize

activerecord/CHANGELOG.md

 *   Remove support for the `protected_attributes` gem.
 
-    *Carlos Antonio da Silva + Roberto Miranda*
+    *Carlos Antonio da Silva*, *Roberto Miranda*
 
 *   Fix accessing of fixtures having non-string labels like Fixnum.
 
@@ -278,7 +278,7 @@
 
     This option enables to define the column name of associated object's type for polymorphic associations.
 
-    *Ulisses Almeida, Kassio Borges*
+    *Ulisses Almeida*, *Kassio Borges*
 
 *   Remove deprecated behavior allowing nested arrays to be passed as query
     values.

activesupport/CHANGELOG.md

 *   Add `SecureRandom.base58` for generation of random base58 strings.
 
-    *Matthew Draper + Guillermo Iguaran*
+    *Matthew Draper*, *Guillermo Iguaran*
 
 *   Add `#prev_day` and `#next_day` counterparts to `#yesterday` and
     `#tomorrow` for `Date`, `Time`, and `DateTime`.
@@ -109,6 +109,8 @@
 *   Add support for error dispatcher classes in `ActiveSupport::Rescuable`.
     Now it acts closer to Ruby's rescue.
 
+    Example:
+
         class BaseController < ApplicationController
           module ErrorDispatcher
             def self.===(other)